Complex sentence: He restored and owns one of the largest yachts in the world, the "Savarona" which was purchased by the Turkish government in 1938 for use as the presidential yacht by Mustafa Kemal Atatürk, but was later allowed to fall into disrepair after his death.
Split into simpler sentences: He restored and owns of one of the largest yachts in the world, the "Savarona". She was purchased by the Turkish government in 1938 for use as a presidential yacht by Mustafa Kemal Atatürk, but was later allowed to fall into disrepair after his death.