Complex sentence: Additionally, Dr. Venture mentions that he believes the "Firestarter" wild-man is "spaced-up on yellow-jackets"; the Yellow Jacket was yet another of Henry Pym's alter-egos.
Split into simpler sentences: Additionally, Dr. Venture mentions that he believes the "Firestarter" wild-man is "spaced-up on yellow-jackets". The Yellow Jacket was yet another of Henry Pym's alter-egos.