Complex sentence: Upon arrival in Queensland, the brothers bought some land in the Darling Downs with the intention of farming; however, Evans got badly injured after a horse riding accident, where he was thrown against a tree, and was unable to do any physical work.
Split into simpler sentences: Upon arrival in Queensland, the brothers bought some land in the Darling Downs with the intention of farming. Evans, however, was badly injured in a horse riding accident, when he was thrown against a tree, and was unable to do any physical work.