Complex sentence: Bernstein and his second wife, screenwriter Nora Ephron, already had an infant son, Jacob, and she was pregnant with their second son, Max, in 1980 when she learned of her husband's affair with Jay.
Split into simpler sentences: Bernstein and his second wife, screenwriter Nora Ephron, already had an infant son, Jacob. She was pregnant with their second son, Max, in 1980 when she learned of her husband's affair with Jay.