Complex sentence: After living outside the country for more than a decade, he considered himself to have become a become an outsider, and joked that he was "writing for the man from Mars", and that he also was from Mars.
Split into simpler sentences: After living outside the country for more than a decade, he considered himself to have become a become an outsider. He joked that he was "writing for the man from Mars" and that he also was from Mars.