Complex sentence: Private Terms (1985--2010) is a millionaire American Thoroughbred racehorse and successful stallion, he is the son of Private Account, who in turn was the son of the great Damascus.
Split into simpler sentences: Private Terms (1985--2010) was a millionaire American Thoroughbred racehorse and successful stallion. He was the son of Private Account, who in turn was the son of the great Damascus.