Complex sentence: During Dummer's War, the first permanent British settlement was established in 1724, with the construction of Fort Dummer protecting the nearby settlements of Dummerston and Brattleboro.
Split into simpler sentences: During Dummer's War, the first permanent British settlement was established in 1724, with the construction of Fort Dummer. It was to protect the nearby settlements of Dummerston and Brattleboro.