Complex sentence: Kalākaua's autocracy and nativism, along with allegations of his corruption, helped convince powerful Caucasians in Hawaii that action should be taken against the King, leading to the June 1887 Constitution, which stripped him of much of his power and significantly weakened the Hawaiian monarchy.
Split into simpler sentences: Kalākaua's autocracy and nativism, along with allegations of his corruption, helped convince powerful Caucasians in Hawaii that action should be taken against the King. This led to the June 1887 Constitution, which stripped Kalākaua of much of his power and significantly weakened the Hawaiian monarchy.