Complex sentence: A Frankenstone monster (voiced by Ted Cassidy) appeared in the 1979 Halloween special, "The Flintstones Meet Rockula and Frankenstone", as Count Rockula's unfinished creation, awoken prematurely when lightning strikes the machinery in Rockula's laboratory.
Split into simpler sentences: A Frankenstone monster (voiced by Ted Cassidy) appeared in the 1979 Halloween special, "The Flintstones Meet Rockula and Frankenstone". This Frankenstone version was Count Rockula's unfinished creation, awoken prematurely when lightning strikes the machinery in Rockula's laboratory.