Complex sentence: The Jackson Park Golf Course, which opened in 1900, was the first public golf course in the Midwest, it was free til 1920, and in 1925 it was named the worlds busiest golf course.
Split into simpler sentences: The Jackson Park Golf Course, which opened in 1900, was the first public golf course in the Midwest. It was free until 1920, and in 1925 it was named the world's busiest golf course.