Complex sentence: The main character is Batman (Roger Craig Smith), a superhero at the peak of human physical perfection and an expert in martial arts who is aided by his butler, Alfred Pennyworth (Martin Jarvis).
Split into simpler sentences: The main character is Batman (Roger Craig Smith), a superhero trained to the peak of human physical perfection and an expert in martial arts. He is aided by his butler Alfred Pennyworth (Martin Jarvis).