Complex sentence: As his career as a superhero begins, Brian fights as the champion of Great Britain, often clashing with S.T.R.I.K.E. and Welsh anti-superhero police officer Dai Thomas, and would develop a rogues gallery including the assassin Slaymaster and the crime matriarch Vixen.
Split into simpler sentences: As his career as a superhero begins, Brian fights as the champion of Great Britain, often clashing with S.T.R.I.K.E. and Welsh anti-superhero police officer Dai Thomas. He would develop a rogues gallery including the assassin Slaymaster and the crime matriarch Vixen.