Complex sentence: Egan was Rod Serling's first choice to narrate "The Twilight Zone", because of his distinctive voice, but contractual issues got in the way, and Serling narrated instead, rather than select any other actor than his first choice.
Split into simpler sentences: Egan was Rod Serling's first choice to narrate "The Twilight Zone", because of his distinctive voice. However, contractual issues got in the way, and Serling narrated instead, rather than select any other actor than his first choice.