Complex sentence: Leigh became pregnant in 1956 and withdrew from the production of Coward's comedy "South Sea Bubble"; the day after her final performance in the play she miscarried and entered a period of depression which lasted for months.
Split into simpler sentences: Leigh became pregnant in 1956 and withdrew from the production of Coward's comedy "South Sea Bubble". The day after her final performance in the play she miscarried and entered a period of depression which lasted for months.