Complex sentence: On July 26,1847, the settlers issued a Declaration of Independence and promulgated a constitution, which, based on the political principles denoted in the United States Constitution, created the independent Republic of Liberia.
Split into simpler sentences: On July 26,1847, the settlers issued a Declaration of Independence and promulgated a constitution. Based on the political principles denoted in the United States Constitution, it established the independent Republic of Liberia.