Complex sentence: In the face of the threat of a further invasion, however, Kaumualii decided to join the kingdom without bloodshed, and became Kamehameha's vassal in 1810, ceding the island to the Kingdom of Hawaii upon his death in 1824.
Split into simpler sentences: In the face of the threat of a further invasion, however, Kaumualii decided to join the kingdom without bloodshed, and became Kamehameha's vassal in 1810. He ceded the island to the Kingdom of Hawaii upon his death in 1824.