Complex sentence: Much of the western portion of Dudley was utilized by the Nipmuc Indians for burial grounds, and in 1986, it was discovered that the town landfill was located over ancient Indian burial sites.
Split into simpler sentences: Much of the western portion of Dudley was used by the Nipmuc Indians for burial grounds. In 1986, it was discovered that the town landfill was located over ancient Indian burial sites.