Complex sentence: Churchill went to England on 23--24 March 1943 and on 15 April parachuted back into the mountains above Saint-Jorioz on the banks of Lake Annecy, however he and Sansom were arrested two days later in St Jorioz by Hugo Bleicher of Abwehr.
Split into simpler sentences: Churchill went to England on 23--24 March 1943 and on 15 April parachuted back into the mountains above Saint-Jorioz on the banks of Lake Annecy. However, he and Sansom were arrested two days later in St. Jorioz by Hugo Bleicher of Abwehr.