Complex sentence: This tension was expressed quite openly during the Sandanista rule, which sought greater state control, and the Miskito were strong supporters of U. S. efforts to undermine the Sandanistas, as important supports of the Contras.
Split into simpler sentences: This tension was expressed openly during Sandanista rule, which sought greater state control. The Miskito were strong supporters of U.S. efforts to undermine the Sandanistas and were important allies of the Contras.