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