Complex sentence: Picard refuses to cooperate with Finn just as Beverly did, but Finn tells him that whether he helps them willingly or not a Federation Captain will make a powerful bargaining chip for his side.
Split into simpler sentences: Picard refuses to cooperate with Finn just as Beverly did, but Finn tells him that whether he helps them willingly or not. Having a Starfleet Captain will make a powerful bargaining chip for his side.