Complex sentence: When he was 14, Duke told Astin that Arnaz was his father, and the two developed a relationship, but in his mid- 20s Astin met a relative of Michael Tell who suggested they were related.
Split into simpler sentences: When he was 14, Duke told Astin that Arnaz was his father, and the two developed a relationship. But in his mid- 20s, Astin met a relative of Michael Tell who suggested they were related.