Complex sentence: When she was in her late teens she had a fling with James Chandler and became pregnant with Lucy after he discovered the pregnancy he left for New York with his family, leaving Elena to be a single mother.
Split into simpler sentences: When she was in her late teens she had a fling with James Chandler and became pregnant with Lucy. After he discovered the pregnancy he left for New York with his family, leaving Elena to be a single mother.