Original: In 1520 Raphael also died, aged 37, and his successor Baldassare Peruzzi maintained changes that Raphael had proposed to the internal arrangement of the three main apses, but otherwise reverted to the Greek Cross plan and other features of Bramante.
Simplified: Raphael also died, in his early 30s, in 1520, before any important changes could be made to the building. The next architect was Peruzzi who like some of the ideas that Raphael had, but did not like the Latin Cross plan.