Complex sentence: During the next few years, he did most of his acting in television commercials, some four hundred of them, including a stint as spokesman for the Ford Motor Company, then came a leading role in the daytime TV series, "The Doctors".
Split into simpler sentences: During the next few years, he did most of his acting in television commercials, some four hundred of them, including a stint as spokesman for the Ford Motor Company. Then came a leading role in the daytime TV series, "The Doctors".