Simplify the following text for a Grade 3 native English-speaking person.
Original: The work of MÃ 1\/4 ller and his wife with orphans began in 1836 with the preparation of their own home at 6 Wilson Street , Bristol for the accommodation of thirty girls .
Simplified: MÃ 1\/4 ller and his wife began working with orphans in 1836 . They then kept thirty girls in their own home .