Complex sentence: He appeared as the kidnapper Randy in the third season cliffhanger finale of "3rd Rock from the Sun"--a role reportedly written especially for him, but he died before filming of the concluding episode could take place.
Split into simpler sentences: He appeared as the kidnapper Randy in the third season cliffhanger finale of "3rd Rock from the Sun"--a role written especially for him. He died before filming of the concluding episode could take place.