Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1955 Clokey showed Gumbasia to movie producer Sam Engel , who encouraged him to develop his technique by adding figures .
Simplified: In 1955 , Art showed Gumbasia to movie producer Sam Engel , who then paid him for a 15 minute film called Gumby Goes to the Moon .