Complex sentence: In addition to Tony's success, during this decade, son Tony Jr. was even given his own short-lived cereal in 1975, Frosted Rice, then he made a comeback in the 2000s replacing his father as the official mascot.
Split into simpler sentences: In addition to Tony's success, during this decade, son Tony Jr. was even given his own short-lived cereal in 1975, Frosted Rice. He would make a comeback in the 2000s by replacing his father as the official mascot.