Complex sentence: During the course of six years and in between two films that he was involved in, Toback wrote a 400-page document of Bugsy's life, however, under some strange circumstances, Toback lost the entire document.
Split into simpler sentences: During the course of six years and in between two films that he was involved in, Toback wrote a 400-page document of Bugsy's life. However, under some strange circumstances, Toback lost the entire document.