Complex sentence: On a 1970 "Bonanza" episode entitled "The Night Virginia City Died", Deputy Clem Foster's pyromanic fiancee levels the town in a series of fires, allowing for a switch to the lesser expensive Warner studios from September 1970 through January 1973.
Split into simpler sentences: On a 1970 "Bonanza" episode entitled "The Night Virginia City Died", Deputy Clem Foster's pyromanic fiancee levels the town in a series of fires. This allowed for a switch to the lesser expensive Warner studios from September 1970 through January 1973.