Simplify the following text for a Grade 5 native English-speaking person.
Original: The southern coast of Honshu runs parallel to the Nankai Trough , which marks the subduction of the Philippine Sea Plate beneath the Eurasian Plate .
Simplified: The southern coast of Honshu runs in the same direction as the Nankai Trough . This marks the place where the Philippine Sea Plate moves under the Eurasian Plate .