Complex sentence: Once owned by Pollitzer family members of North Carolina, it was displayed at Columbia College in South Carolina, where O'Keeffe was an instructor, before it was acquired by High Museum of Art of Atlanta by 2015.
Split into simpler sentences: Once owned by Pollitzer family members of North Carolina, it was displayed at Columbia College in South Carolina, where O'Keeffe was an instructor. It was acquired by High Museum of Art of Atlanta by 2015.