Complex sentence: The Basu massif, located east of the Amdo terrane in the Dingqing-Nujiang area, is approximately 200 km long and up to 50 km wide and largely composed of metasedimentary rocks and granitic gneiss that is surrounded by Late Triassic-Early Jurassic ophiolitic melange.
Split into simpler sentences: The Basu massif, located east of the Amdo terrane in the Dingqing-Nujiang area, is approximately 200 km long and up to 50 km wide. It is largely composed of metasedimentary rocks and granitic gneiss that is surrounded by Late Triassic-Early Jurassic ophiolitic melange.