Complex sentence: In 1927, the Gennett studios in Richmond, Indiana, made a recording of black fiddler Jim Booker with other instrumentalists; their recordings were labeled "made for Hillbilly" in the Gennett files, and were marketed to a white audience.
Split into simpler sentences: In 1927, the Gennett studios in Richmond, Indiana made a recording of black fiddler Jim Booker. The recordings were labeled "made for Hillbilly" in the Gennett files and were marketed to a white audience.