Your code splits on commas but your sample data has no commas.

To produce all the networks in the format you have shown, sorted by building and VLAN, I might do something like the following:

use strict;
use warnings;
use Data::Dumper;

do {

    print <<EOF;
Building name      $_->[8]
VLAN number        $_->[0]
VLAN 1st Octet     $_->[1]
VLAN 2nd Octet     $_->[2]
VLAN 3rd Octet     $_->[3]
VLAN 4th Octet     $_->[4]
VLAN Subnet Slash  $_->[5]
VLAN Subnet Dotted $_->[6]
VLAN Network       $_->[7]
VLAN Description   $_->[9]

EOF

} for sort { $a->[8] cmp $b->[8] or $a->[0] <=> $b->[0] }
    map { [ unpack('(A3 x1)6 (A15 x1)2 A11 x1 A*') ] } <DATA>;

__DATA__
321 10  32  32  0   19  255.255.224.0   10.32.32.0 /19  Building1   Da
+ta VLAN
322 10  32      0   24  255.255.255.0   10.32..0 /24    Building1   Da
+ta VLAN
323 10  32  128 0   19  255.255.224.0   10.32.128.0 /19 Building1   Da
+ta VLAN
324 10  32  96  0   19  255.255.224.0   10.32.96.0 /19  Building1   Da
+ta VLAN
325 10  32  160 0   19  255.255.224.0   10.32.160.0 /19 Building1   Da
+ta VLAN
326 10  32  192 0   19  255.255.224.0   10.32.192.0 /19 Building1   Da
+ta VLAN
327 10  32  64  0   19  255.255.224.0   10.32.64.0 /19  Building1   Da
+ta VLAN
328 10  32  248 0   22  255.255.252.0   10.32.248.0 /22 Building1   Da
+ta VLAN
329 10  32      0   24  255.255.255.0   10.32..0 /24    Building1   Da
+ta VLAN
330 10  32  224 0   24  255.255.255.0   10.32.224.0 /24 Building1   Da
+ta VLAN
331 10  32  225 0   24  255.255.255.0   10.32.225.0 /24 Building2   Da
+ta VLAN
332 10  32  228 0   24  255.255.255.0   10.32.228.0 /24 Building2   Da
+ta VLAN
333 10  32  229 0   24  255.255.255.0   10.32.229.0 /24 Building2   Da
+ta VLAN
334 10  32  232 0   24  255.255.255.0   10.32.232.0 /24 Building2   Da
+ta VLAN
335 10  32  233 0   24  255.255.255.0   10.32.233.0 /24 Building2   Da
+ta VLAN
336 10  32  236 0   24  255.255.255.0   10.32.236.0 /24 Building2   Da
+ta VLAN
337 10  32  237 0   24  255.255.255.0   10.32.237.0 /24 Building2   Da
+ta VLAN
338 10  32  240 0   24  255.255.255.0   10.32.240.0 /24 Building2   Da
+ta VLAN
339 10  32  241 0   24  255.255.255.0   10.32.241.0 /24 Building2   Da
+ta VLAN
340 10  32  244 0   24  255.255.255.0   10.32.244.0 /24 Building2   Da
+ta VLAN
341 10  32  245 0   24  255.255.255.0   10.32.245.0 /24 Building3   Da
+ta VLAN
342 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
343 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
344 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
345 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
346 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
347 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
348 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
349 10  32      0   24  255.255.255.0   10.32..0 /24    Building3   Da
+ta VLAN
350 10  32  2   0   23  255.255.254.0   10.32.2.0 /23   Building3   Da
+ta VLAN
351 10  32  4   0   23  255.255.254.0   10.32.4.0 /23   Building4   Da
+ta VLAN
352 10  32  6   0   23  255.255.254.0   10.32.6.0 /23   Building4   Da
+ta VLAN
353 10  32  8   0   23  255.255.254.0   10.32.8.0 /23   Building4   Da
+ta VLAN
354 10  32  10  0   23  255.255.254.0   10.32.10.0 /23  Building4   Da
+ta VLAN
355 10  32  12  0   23  255.255.254.0   10.32.12.0 /23  Building4   Da
+ta VLAN
356 10  32  14  0   23  255.255.254.0   10.32.14.0 /23  Building4   Da
+ta VLAN
365 10  33  32  0   24  255.255.255.0   10.33.32.0 /24  Building4   Da
+ta VLAN
606 10  0   249 0   29  255.255.255.248 10.0.249.0 /29  Building4   Da
+ta VLAN
[download]

But the sorting appears to be unnecessary as the data you have provided is already sorted.