Complex sentence: In the United States, the Visitability movement was begun by grass roots advocates led by Eleanor Smith in an organization called Concrete Change, who originated and developed the concept in 1986, at that time using the term "Basic Home Access".
Split into simpler sentences: In the United States, the Visitability movement was begun by grass roots advocates led by Eleanor Smith in an organization called Concrete Change. She originated and developed the concept in 1986, at that time using the term "Basic Home Access".