Complex sentence: They chose "Schweinestall-Studio" next to Husum as the recording studio which was run by Detlef Petersen, producer and former keyboard player of the German-English band "Lake", alongside Geoffrey Peacey.
Split into simpler sentences: They chose "Schweinestall-Studio" near Husum as the recording studio. It was run by Detlef Petersen, producer and former keyboard player of the German-English band "Lake", alongside Geoffrey Peacey.