There are lots of way that this could be done.
Here is a not-very-elegant solution using a regular expression.

cat users.txt
aanis <aanis@xyz.com> (Anis Ahmed A) accessed 2007/10/04
aaputin <aaputin@xyz.com> (Artem Aputin) accessed 2007/10/04
aazarov <alexey.azarov@tlmcom.ru> (Alexey Azarov) accessed 2007/10/04

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my %users;

open my $fh, '<', 'users.txt' or die "$!\n";

while (my $line = <$fh>) {
    chomp($line);
    my ($user, $fullname, $lastaccess) = ($line =~ m/([a-z]+).*?\((.*?
+)\).*?([\d\/]+)$/);
    $users{$user}{fullname} = $fullname;
    $users{$user}{lastaccess} = $lastaccess;
}

print Dumper(\%users);
[download]

Which gives:

$VAR1 = {
          'aanis' => {
                       'lastaccess' => '2007/10/04',
                       'fullname' => 'Anis Ahmed A'
                     },
          'aazarov' => {
                         'lastaccess' => '2007/10/04',
                         'fullname' => 'Alexey Azarov'
                       },
          'aaputin' => {
                         'lastaccess' => '2007/10/04',
                         'fullname' => 'Artem Aputin'
                       }
        };
[download]

Cheers,
Darren