Complex sentence: He did not view himself as a politician, and was not seeking a political career, and though he joined Likud in the 1990s he was not openly active as he didn't believe that an active sportsman should involve himself in politics.
Split into simpler sentences: He did not view himself as a politician, and was not seeking a political career. Though he joined the Likud party in the 1990s, he was not openly active in politics because he didn't believe that an active sportsman should involve himself in politics.