Looks like an array of hashes to me. Something like this (you can finish it if you use it):

use strict;

my $hash;
my $trap;
my @data;

while (<DATA>)
{
    chomp;
    next if ($_ =~ /^\s*$/);

    if ($_ =~ /^Date:\s+(.+)$/)
    {
        push(@data, $hash) if (defined($hash));
        $hash = {DATE => $1};
    }

    if ($_ =~ /^SServer:\s+(.+)$/)
    {
        $hash->{SSERVER} = $1;
    }
    elsif ($_ =~ /^Device:\s+(.+)$/)
    {
        $hash->{DEVICE} = $1;
    }
    elsif ($_ =~ /^CString:\s+(.+)$/)
    {
        $hash->{CSTRING} = $1;
    }
    elsif ($_ =~ /^Port:\s+(.+)$/)
    {
        $hash->{PORT} = $1;
    }
    elsif ($_ =~ /^SNMP Traps Generated:/)
    {
        $hash->{TRAPS} = {TRAP_LIST => []};
    }
    elsif ($_ =~ /^\s+Generic:\s+(.+)$/)
    {
        $hash->{TRAPS}->{GENERIC} = $1;
    }
    elsif ($_ =~ /^\s+Specific:\s+(.+)$/)
    {
        $hash->{TRAPS}->{SPECIFIC} = $1;
    }
    elsif ($_ =~ /^\s+Varbind:\s+(.+)$/)
    {
        $trap = {VARBIND => $1};
    }
    elsif ($_ =~ /^\s+Type:\s+(.+)$/)
    {
        $trap->{TYPE} = $1;
    }
    elsif ($_ =~ /^\s+Data:\s+(.+)$/)
    {
        $trap->{DATA} = $1;
        push(@{$hash->{TRAPS}->{TRAP_LIST}}, $trap);
    }
}

push(@data, $hash) if (defined($hash));

my ($item, $key, $value);

foreach $item (@data)
{
    while (($key, $value) = each %$item)
    {
        print "$key => $value\n";
    }

    print "\n";
}

__DATA__
Date:      Mon Feb 17 13:14:19 2003
SServer:   formula3
Device:    111.222.123.124
CString:   public
Port:      162

SNMP Traps Generated:

    Trap OID:    1.3.6.1.4
      Generic:   2
      Specific:  0
        Varbind: 1.3.6.1.2.1.2.2.1.1
        Type:    2
        Data:    10
        Varbind: 1.3.6.1.2.1.2.2.1.1
        Type:    2
        Data:    20
        Varbind: 1.3.6.1.2.1.2.2.1.7
        Type:    2
        Data:    20
        Varbind: 1.3.6.1.2.1.2.2.1.8
        Type:    2
        Data:    30

Date:      Mon Feb 17 13:14:22 2003
SServer:   formula3
Device:    111.164.121.125
CString:   public
Port:      162

SNMP Traps Generated:

    Trap OID:    1.3.6.1.4
      Generic:   3
      Specific:  0
        Varbind: 1.3.6.1.2.1.2.2.1.1
        Type:    2
        Data:    12
        Varbind: 1.3.6.1.2.1.2.2.1.1
        Type:    2
        Data:    20
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