Complex sentence: Schallert is probably best known as Martin Lane on "The Patty Duke Show"; he also appeared as a wise teacher, Mr. Leander Pomfritt on "The Many Loves of Dobie Gillis", and also as The Admiral on "Get Smart".
Split into simpler sentences: Schallert is probably best known as Martin Lane on "The Patty Duke Show". He also appeared as a wise teacher, Mr. Leander Pomfritt on "The Many Loves of Dobie Gillis", and as The Admiral on "Get Smart".