Complex sentence: This supplemented his finances, and enabled him to travel around Europe, interacting with other cartoonists, gaining considerable knowledge and exposure, this lead to his meeting of Sir Ronald Searle, whom Mario considered as his mentor.
Split into simpler sentences: This supplemented his finances, and enabled him to travel around Europe, interacting with other cartoonists, gaining considerable knowledge and exposure. This led to his meeting of Sir Ronald Searle, whom Mario considered as his mentor.