Complex sentence: His cultural ad libs, which were not in the script, are what hold up in the long run, which can be confirmed, by viewing the number of hits, that the What's Happening Boys get on youtube.
Split into simpler sentences: His cultural ad libs, which were not in the script, are what hold up in the long run. Confirmation of this can be seen by viewing the number of hits that the What's Happening Boys get on youtube.