Complex sentence: The media, in discussing disco, emphasized its roots in gay culture--few had objections to African-American influence in music by 1979, while the Latino influence was little-discussed.
Split into simpler sentences: The media, in discussing disco, emphasized its roots in gay culture. The other roots of disco were less emphasized, as few had objections to African-American influence in music by 1979, while the Latino role in disco's origins was little-discussed.