Simplify the following text for a Grade 4 native English-speaking person.
Original: Locke 's father , who was also named John Locke , was a country lawyer and clerk to the Justices of the Peace in Chew Magna , who had served as a captain of cavalry for the Parliamentarian forces during the early part of the English Civil War .
Simplified: Locke 's father , who was also named John Locke , was a country lawyer . He had served as a captain in the early part of the English Civil War .