Complex sentence: The team studied Monkey Punch's style in detail, including the influence of American cartoonist Mort Drucker on the manga, and analysed the characters from all angles; they were initially assisted by Monkey Punch himself until he felt the project was too much for him.
Split into simpler sentences: The team studied Monkey Punch's style in detail and analysed the characters from all angles. They were initially assisted by Monkey Punch until he felt the project was too much for him.