Bartolomeo Ammanati's three lovely elliptical arches follow drawings by Michelangelo.
Michelangelo's drawings precede the elliptical arches made by Bartolomeo Ammanati. 
mnli hypothesis: Michelangelo's drawings precede the elliptical arches made by Bartolomeo Ammanati.  premise: Bartolomeo Ammanati's three lovely elliptical arches follow drawings by Michelangelo.