Then in the early 1600s, Galileo Galilei, an Italian astronomer, mathematician and physicist, used a telescope to discover mountains on the moon, four moons of Jupiter and other astronomical objects.
(Galileo Galilei; [is]; an Italian astronomer) (Galileo Galilei; [is] an astronomer [from]; Italy)
Galileo Galilei Galileo Galilei
[is] [is] an astronomer [from]
an Italian astronomer
Italy