use strict;
my @outputs;

while (<DATA>) {
    my @fields = split;
    push @fields, '' if ( @fields == 3 );
    for my $i ( 0..$#fields ) {
        $outputs[$i] .= $fields[$i] . '|';
    }
}
chop @outputs;   # remove final '|';
print "$_\n" for ( @outputs );

__DATA__
ID1 > 66
ID2 between 6 10
ID3 < 7