Complex sentence: Adult film star Harry Reems was originally signed to play Coach Calhoun; however, executives at Paramount nixed the idea due to Reems' previous work in pornography, and producers cast Sid Caesar instead.
Split into simpler sentences: Adult film star Harry Reems was originally signed to play Coach Calhoun. However, executives at Paramount nixed the idea due to Reems' previous work in pornography, and producers cast Sid Caesar instead.