I'd probably do it this way.

#! perl -slw
use strict;

until( eof( DATA ) ) {
    no warnings 'uninitialized';
    printf '%-7.7s %-7.7s ',     <DATA> =~ m[ ([^,]+) , \s* (.+) $]x;
    printf '%7.7s %7.7s %7.7s ', <DATA> =~ m[ ([^/]+) / (?:(\S+)\s+)? 
+(\S+) $]x;
    printf "%s\n",               <DATA> =~ m[^(\S+)];
}

__DATA__
Alanon, Bart
5590/EL
----
O'Lewis, John.
----/--- --
john
Le Much,Bo Jo
3406/165 NS
ed@a.nl
Abe-Jen, Mar-Jo
3421/164D NS
cbest
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Output

P:\test>351465
Alanon  Bart       5590              EL ----
O'Lewis John.      ----     ---      -- john
Le Much Bo Jo      3406     165      NS ed@a.nl
Abe-Jen Mar-Jo     3421    164D      NS cbest
[download]