Complex sentence: Claire received a grand piano as a gift for her 6th birthday She noodled around on her own, got some help from her mother, who knew how to read music, and enrolled into Settlement Music School of Philadelphia when she was 7.
Split into simpler sentences: Claire received a grand piano as a gift for her 6th birthday. She initially studied the instrument with her mother, but enrolled into Settlement Music School of Philadelphia when she was 7.