Simplify the following text for a Grade 7 native English-speaking person.
Original: Locke became involved in politics when Shaftesbury became Lord Chancellor in 1672 . Following Shaftesbury 's fall from favor in 1675 , Locke spent some time traveling across France as tutor and medical attendant to Caleb Banks .
Simplified: However , after Shaftesbury began to fall from favor in 1675 , Locke decided to travel across France .