Complex sentence: They discovered prehistoric rock art sites, including the Cave of Swimmers, in Uweinat and Gilf Kebir, and Almásy claimed that in 1933 he found the third valley of Zerzura in Wadi Talh.
Split into simpler sentences: They discovered prehistoric rock art sites, including the Cave of Swimmers in Uweinat and Gilf Kebir. In 1933, Almásy claimed that he found the third valley of Zerzura in Wadi Talh.