Simplify the following text for a Grade 3 native English-speaking person.
Original: The next year , he bred 11 mares , but in 1956 , he bred 102 mares at $ 500 ( approximately $ as of ) each .
Simplified: The next year , he only bred 11 mares . In 1956 , he bred 102 mares at $ 500 ( $ as of ) each .