Complex sentence: The ship and crew are led by Captain James T. Kirk (William Shatner), first officer and science officer Mr. Spock (Leonard Nimoy), and chief medical officer Leonard McCoy (DeForest Kelley).
Split into simpler sentences: The ship and crew are commanded by Captain James T. Kirk (William Shatner). The First officer and science officer is Mr. Spock (Leonard Nimoy), and the chief medical officer is Leonard McCoy (DeForest Kelley).