Complex sentence: Placed on the corpse was a map purportedly showing the locations of British minefields; the Germans used the map and their tanks were routed to areas of soft sand where they bogged down.
Split into simpler sentences: Placed on the corpse was a map purportedly showing the locations of British minefields. The Germans fell for the ruse, and German tanks were routed to areas of soft sand where they bogged down.