#!/bin/bash
# http://stackoverflow.com/questions/28942535/bourne-shell-split-string-according-to-multiple-criteria-iptables-multiport-li
awk -v RS=',' -F : '{ gsub(/\n$/, "") } NF > 1 { r=(r ? r "," : "") $0;                                                                              
        if (r ~ /([^,]*,){6}/) { print r; r=""; } next }                        
    { s=(s ? s "," : "") $0;                                                    
        if (s ~ /([^,]*,){14}/) { print s; s=""; } }                            
    END { if (r && s) {                                                         
            p = r "," s; if (p !~ /([^,:]*[:,]){15}/) { print p; r=s="" } }     
        if (r) print r; if (s) print s }'

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21:22,23:24,25:26,27:28,29,30:40,60:61,62:63,64:65,70