Complex sentence: In the 1970s after graduate school, her works became more abstract and were included in many New York City exhibitions, at a time when Native American artists' works were not often exhibited, and in 1978 she had a solo exhibition at Bertha Urdang Gallery.
Split into simpler sentences: In the 1970s after graduate school, her works became more abstract and were included in many New York City exhibitions, at a time when Native American artists' works were seldom exhibited. In 1978 she had a solo exhibition at Bertha Urdang Gallery.