Complex sentence: Stelle is a small village in N.E. Illinois which started as an intentional community in the early 1970s by a then, recently formed group from Chicago, that had a vision of creating a more sustainable and compassionate way of living.
Split into simpler sentences: Stelle is a small village in N.E. Illinois that began as an intentional community during the early 1970s. The founding residents belonged to a recently formed group from Chicago, whose vision was to create creating a more sustainable and compassionate way of living.