Complex sentence: Houghton was replaced by Brian Kerwin, who aired from 1976 to 1977, followed by Wings Hauser from 1977 to 1981 and Howard McGillin from 1981 to 1982.
Split into simpler sentences: Houghton was replaced by Brian Kerwin, who aired from 1976 to 1977. He was followed by Wings Hauser from 1977 to 1981 and Howard McGillin from 1981 to 1982.