Complex sentence: The series was simply called The Transformers until the relaunch in 1992 was titled, after which fans applied the name Generation 1 (later made official by Hasbro) as a method of separating the different Transformers eras.
Split into simpler sentences: The series was simply called The Transformers until the relaunch in 1992 was titled. Fans applied the name Generation 1 (later made official by Hasbro) as a method of separating the different Transformers eras.