use Sort::Key qw(keysort);
my @array = ( '1-1', '2-5', '2', '6', '1-10', '1-3','2-1');
my @sorted = keysort { pack "N*", split /-/, $_ } @array;
update: or with the new Sort::Key::Natural I have just released:
use Sort::Key::Natural 'natsort';
my @sorted = natsort @array;
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