Simplify the following text for a Grade 10 native English-speaking person.
Original: Vostok 1 was launched by the Soviet space program , and was designed by Soviet engineers guided by Sergey Korolyov under military supervision of Kerim Kerimov and others .
Simplified: The Vostok 1 was launched by the Soviet space program and made by the Soviet rocket scientists Sergey Korolyov and Kerim Kerimov .