Complex sentence: Brodhead marched into the Ohio Country and destroyed the Delaware Indian capital of Coshocton in April 1781, but this only made the Delawares more determined enemies, and deprived Clark of badly needed men and supplies for the Detroit campaign.
Split into simpler sentences: Brodhead marched into the Ohio Country and destroyed the Delaware Indian capital of Coshocton in April 1781. This resulted in the Delaware becoming more determined enemies, and deprived Clark of badly needed men and supplies for the Detroit campaign.