Complex sentence: The act ignited a fresh wave of outrage from those opposing the pipelines, many of whom felt that DAPL was an act of undisguised environmental racism due to its intentional relocation from a predominantly white town to an area directly next to the Standing Rock Sioux Reservation.
Split into simpler sentences: The act ignited a fresh wave of outrage from those opposing the pipelines. Members of surrounding communities in Standing Rock felt that DAPL was an act of undisguised environmental racism due to its intentional relocation from a predominantly white town to an area directly next to the Standing Rock Sioux Reservation.