Complex sentence: Mazer earned the nickname "The A-Maz-In" for his deep knowledge of sports trivia, which was made evident while hosting his WNBC radio show in the 1960s.
Split into simpler sentences: Mazer earned the nickname "The A-Maz-In" for his deep knowledge of sports trivia. This was made evident while hosting his WNBC radio show in the 1960s.