Complex sentence: The groups purchased Belgrave House in Littlehampton so that they could return regularly and in 1924 also decided to rent a field at Climping which was used as a canvas camp site.
Split into simpler sentences: The groups purchased Belgrave House in Littlehampton so that they could return regularly. Then in 1924 they decided to rent a field at Climping which was used as a canvas camp site.