Complex sentence: Hartlens point was long time military property, and also an additional 285 acres was purchased, a community of houses was expropriated when the battery installment had taken place, this also removed any inhabitants from danger in the event of action.
Split into simpler sentences: Hartlens Point was long-time military property, and also an additional 285 acres was purchased--a community of houses was expropriated when the battery installment had taken place. This removed any inhabitants from danger in the event of action.