Complex sentence: He was released in 1996 after serving a partial sentence (8 years instead of 15), but he was convicted in 2006 by a United States court to serve another 7 years.
Split into simpler sentences: He was released in 1996 after serving a partial sentence of 8 years instead of 15. In 2006, he was later convicted by a United States court to serve another 7 years.