Complex sentence: Upon Genie's removal from this location in April 1977 she required a two-week stay at Children's Hospital, where she was able to see her mother and the Riglers, and her condition somewhat improved but she continued mostly using sign language to communicate.
Split into simpler sentences: Upon Genie's removal from this location in April 1977 she required a two-week stay at Children's Hospital, where she was able to see her mother and the Riglers. While she was there her condition somewhat improved, but she continued mostly using sign language to communicate.