Complex sentence: The Juan de Fuca Plate, named after the explorer of the same name, is a tectonic plate, generated from the Juan de Fuca Ridge, and subducting under the northerly portion of the western side of the North American Plate at the Cascadia subduction zone.
Split into simpler sentences: The Juan de Fuca Plate, named after the explorer of the same name. It is a tectonic plate generated from the Juan de Fuca Ridge and is currently subducting under the northerly portion of the western side of the North American Plate at the Cascadia subduction zone.