Complex sentence: The flag of South Carolina was originally designed in 1775 for use by South Carolina troops during the American Revolutionary War and borrowed the blue from the militia's uniforms and a crecent from the emblem on their caps.
Split into simpler sentences: The flag of South Carolina is believed to have been originally designed in 1775 for use by South Carolinian troops during the American Revolutionary War. The blue of the flag was borrowed from the militia's uniforms and the crescent from the emblem on their caps.