Complex sentence: According to Cross, he believed that his life choice had caused his illness, so he wanted to change his lifestyle and so in 2005, when he was 40, he decided to consume only juice for 60 days in order to improve his health.
Split into simpler sentences: According to Cross, he believed that his life choices had caused his illness and he wanted to change his lifestyle. In 2005, when he was 40, he decided to consume only juice for 60 days in order to improve his health.