Simplify the following text for a Grade 11 native English-speaking person.
Original: Burnham later became close friends with others involved in the Scouting movement in the United States , such as Theodore Roosevelt , the Chief Scout Citizen , and Gifford Pinchot , the Chief Scout Forester .
Simplified: Burnham later became close friends with others in Scouting , such as Theodore Roosevelt , the Chief Scout Citizen , and Gifford Pinchot , the Chief Scout Forester .