Complex sentence: There were two American Revolutionary War actions fought on the hillside, the first was in March 1781 under von Steuben and his Virginia Militia, the second in April 1781, under Lafayette.
Split into simpler sentences: There were two American Revolutionary War actions fought on the hillside. The first was in March 1781 under von Steuben and his Virginia Militia; the second in April 1781, under Lafayette.