Complex sentence: These were organizations advocating for the inclusion of people with Down Syndrome into the general school system and for a greater understanding of the condition among the general population, as well as groups providing support for families with children with Down syndrome.
Split into simpler sentences: These were organizations advocating for the inclusion of people with Down Syndrome into the general school system and for a greater understanding of the condition among the general population. As well as groups providing support for families with children with Down syndrome.