Complex sentence: It was there that he produced a number of popular Western-themed TV series including "Wagon Train" (1957-1965), "Laredo" (1965-67) and "The Virginian" (1969-1970).
Split into simpler sentences: It was there that he produced a number of popular Western-themed TV series. He also produced "Laredo" (1965-67) and "The Virginian" (1969-1970).