Final answer:
The sentence should correct the possessive 'artist's' and the plural 'contemporaries' to accurately reflect Georgia O'Keeffe's status as an artist known for her abstracted drawings and her significant contribution to American abstraction.
Step-by-step explanation:
To fix the two plural or possessive errors in the sentence: Georgia O'Keeffe was a well-known American painter. The artists work combined abstract and representational elements, an innovative approach that made her stand out among her American contemporaries'. The corrected sentence should read: Georgia O'Keeffe was a well-known American painter.
The artist's work combined abstract and representational elements, an innovative approach that made her stand out among her American contemporaries. Georgia O'Keeffe is renowned for her contribution to American abstraction, creating oversized depictions of flowers and combining skulls with flowers in her art. She continued to develop her abstracted drawings and maintain her unique style throughout her career, making her one of the most famous artists of her time.