Complex sentence: The Bonnie Blue flag had a single five-point star centered in a blue background and was previously used as the flag of the short-lived Republic of West Florida in 1810, which included parts of modern-day Alabama, Mississippi and Louisiana.
Split into simpler sentences: The Bonnie Blue flag features a single five-point star centered in a blue background. It was used as the flag of the short-lived Republic of West Florida in 1810, which included parts of modern-day Alabama, Mississippi and Louisiana.