Simplify the following text for a Grade 4 native English-speaking person.
Original: The number of horses declined from 35 million in 1916 to 24 million in 1920 , and cattle from 58 to 37 million .
Simplified: Number of horses fell from 35 million ( in 1916 ) to 24 million ( in 1920 ) . The number of cattle also became less , from 58 million to 37 million .