Complex sentence: The Baroncelli family owned the tomb on the external wall, which was designed by Giovanni di Balduccio in 1327; the latter also sculpted the statuettes of the Archangel Gabriel and the Annunciation on the arcade's pillars.
Split into simpler sentences: The Baroncelli family owned the tomb on the external wall, which was designed by Giovanni di Balduccio in 1327. He also sculpted the statuettes of the Archangel Gabriel and the Annunciation on the arcade's pillars.