Complex sentence: During this battle, the Moultrie flew a flag of his own design (authorized by the colonial government), later called the Moultrie flag or Liberty flag, that became iconic to the Revolution in the South.
Split into simpler sentences: During this battle, the Moultrie flew a flag of his own design, authorized by the colonial government. It was later called the Moultrie flag or Liberty flag and became iconic to the Revolution in the South.