Complex sentence: In 1956 Tillim married Muriel Sharon (1919--1996), director of the Children's Theatre at the YMHA, New York; in 1998 he married the art historian Diane Radycki (b.1946).
Split into simpler sentences: In 1956 Tillim married Muriel Sharon (1919--1996), director of the Children's Theatre at the YMHA, New York. In 1998 Tillim married the art historian Diane Radycki (b.1946).