Simplify the following text for a Grade 9 native English-speaking person.
Original: Huygens was inspired by Galileo 's discovery of Jupiter 's four largest moons in 1610 and his improvements on telescope technology .
Simplified: Earlier , in 1610 , the astronomer Galileo Galilei had discovered four of Jupiter 's moons . This inspired Huygens : he also wanted to discover new moons .