Complex sentence: During the late 17th century, the colonists began to import more African slave labor than arrange for indentured servants, as economic conditions improved in England and workers did not want to come to the colonies, where conditions were harsh.
Split into simpler sentences: During the late 17th century, the colonists began to import more African slave labor than arrange for indentured servants. As economic conditions improved in England, workers did not want to come to the colonies, where conditions were harsh.