A major breakthrough would come with Isaac Newton's discovery that gravity keeps the planets revolving in predictable orbits around the sun.
(A major breakthrough; would come; ) (gravity; keeps; the planets revolving in predictable orbits around the sun) (the planets; revolving; in predictable orbits around the sun)
A major breakthrough gravity the planets
would come keeps revolving
the planets revolving in predictable orbits around the sun
in predictable orbits around the sun