Complex sentence: The successful artists of the next generation were Leonardo's teacher Verrocchio, Antonio del Pollaiuolo and the portrait sculptor Mino da Fiesole, whose lifelike busts give the most reliable likenesses of Lorenzo Medici's father Piero and uncle Giovanni.
Split into simpler sentences: The successful artists of the next generation were Leonardo's teacher Verrocchio, Antonio del Pollaiuolo, and the portrait sculptor Mino da Fiesole. The latter's lifelike busts give the most reliable likenesses of Lorenzo Medici's father Piero and uncle Giovanni.