Complex sentence: The subducting Nazca Plate, which exhibits unusual flat-slab subduction, is tearing as well as deforming as it is subducted (Barzangi and Isacks) has formed, and continues to form the volcanic Andes Mountain Range.
Split into simpler sentences: The subducting Nazca Plate, which exhibits unusual flat-slab subduction, is tearing as well as deforming as it is subducted (Barzangi and Isacks). The subduction has formed, and continues to form the volcanic Andes Mountain Range.