Original sentence: It is certainly true that Shostakovich borrows extensively from the material and styles both of earlier composers and of popular music; the vulgarity of "low" music is a notable influence on this "greatest of eclectics"
Edited sentence: It is certainly true that Shostakovich borrows extensively from the material and styles both of earlier composers and of popular music, with the shrillness of Mahler and the vulgarity of "low" music prominent influences on this "greatest of eclectics"