Complex sentence: Starkey planners had wanted to place two RN battleships within the amphibious force to act as bait for the Luftwaffe, but the RN was unwilling to risk its battleships in such a manner.
Split into simpler sentences: Starkey planners had wanted to place two RN battleships within the amphibious force to act as bait for the Luftwaffe. The RN was unwilling to risk its battleships in such a manner.