Complex sentence: He was buried in the Protestant Cemetery, Rome, between the Porta San Paolo and Monte Testaccio, a place that he knew well: also in that cemetery are the graves of Keats and Shelley and one great Cornishman, Edward John Trelawny.
Split into simpler sentences: He was buried in the Protestant Cemetery, Rome, between the Porta San Paolo and Monte Testaccio, a place that he knew well. He is buried there with Keats and Shelley and one great Cornishman, Edward John Trelawny.