Complex sentence: Kennedy is best remembered for his starring role in the syndicated series "Steve Donovan, Western Marshal", with Eddy Waller, and as one of the policemen who vanishes in the science fiction classic "Invaders from Mars".
Split into simpler sentences: Kennedy is best remembered for his starring role in the syndicated series "Steve Donovan, Western Marshal", with Eddy Waller. He was also one of the policemen who vanishes in the science fiction classic, "Invaders from Mars".