Complex sentence: The Port of Mobile, founded by the French and subsequently controlled by England, Spain, and the United States, has long had an ethnically diverse population, and has served as an entry point for various groups settling in other parts of the state.
Split into simpler sentences: The Port of Mobile, founded by the French and subsequently controlled by England, Spain, and the United States, has long had an ethnically diverse population. It has long served as an entry point for various groups settling in other parts of the state.