Sangallo's main practical contribution was to strengthen Bramante's piers which had begun to crack.
The main job that he did was to strengthen Bramante's piers which had begun to crack.
The main job that he did was to strengthen Bramante's piers which had begun to crack.
Haz esto más simple: Sangallo's main practical contribution was to strengthen Bramante's piers which had begun to crack. Producción: