Complex sentence: Missionaries arrived in 1820, and most of the aliʻi converted to Christianity, including Kaʻahumanu and Keōpūolani, but it took 11 years for Kaʻahumanu to proclaim laws against ancient religious practices.
Split into simpler sentences: Missionaries arrived in 1820, and most of the aliʻi converted to Christianity, including Kaʻahumanu and Keōpūolani. It took 11 years for Kaʻahumanu to proclaim laws against ancient religious practices.