Simplify the following text for a Grade 13 native English-speaking person.
Original: The Oenpelli Mission began in 1925 , when the Church of England Missionary Society accepted an offer from the Northern Territory Administration to take over the area , which had been operated as a dairy farm .
Simplified: The Oenpelli Mission began in 1925 , when the Church of England Missionary Society accepted an offer from the Northern Territory Administration to take over the area , which had been used as a dairy farm .