G'day epimenidecretese,

"I'm not sure if perl it's the right tool for it."

Perl would be an admirable tool for this task.

#!/usr/bin/env perl

use strict;
use warnings;

while (<DATA>) {
    my ($name, $code) = (split)[0,-1];
    print $code eq 'I-GPE' ? " $name" : $. == 1 ? $name : "\n$name";
}

print "\n";

__DATA__
Buenos  -   SPN Buenos  B-GPE
Aires   -   SPN Aires   I-GPE
Afghanistan -   SPN Afghanistan B-GPE
Europa  -   SPN Europa  B-GPE
UE  -   I   UE  B-GPE
Italia  -   SPN Italia  B-GPE
Provincia   -   SS  Provincia   B-GPE
di  -   E   di  I-GPE
Lucca   -   SPN Lucca   I-GPE
[download]

Output:

Buenos Aires
Afghanistan
Europa
UE
Italia
Provincia di Lucca
[download]