Complex sentence: I was aware of his appearances on the Rowan & Martin Laugh In Television show and those famous lines,'Oh that Henny Youngman but I have to admit I didn't remember ever seeing him perform his stand up routine.
Split into simpler sentences: I was aware of his appearances on the Rowan & Martin Laugh-In Television show and those famous lines, "Oh that Henny Youngman". But I have to admit I didn't remember ever seeing him perform his stand up routine.