Complex sentence: He is most well known for appearing in recurring episodes of all three 90 minute western television shows that aired during the 1960s: "Wagon Train", "The Virginian" and "Cimarron Strip".
Split into simpler sentences: He is most well known for appearing in recurring episodes of all three 90 minute western television shows that aired during the 1960s. They are "Wagon Train", "The Virginian" and "Cimarron Strip".