Complex sentence: The company petitioned the King to affirm their right to the colony; however, he declined and replied that, though he was sorry that the company had incurred such huge losses, to claim Darien would mean war with Spain.
Split into simpler sentences: The company petitioned the King to affirm their right to the colony. However, the monarch declined, saying that although he was sorry the company had incurred such huge losses, reclaiming Darien would mean war with Spain.