Complex sentence: The city initially grew slowly, subject to numerous attacks from Native American tribes and threats of Spanish invasion before flourishing as a center for shipbuilding and later in the antebellum period as the aristocratic center for the Lowcountry plantation economy up through the Civil War.
Split into simpler sentences: The city initially grew slowly, subject to numerous attacks from Native American tribes and threats of Spanish invasion. It flourished first as a center for shipbuilding and later, when the colony was established as a slave society, as the elite center for the Lowcountry plantersthrough the Civil War.