Complex sentence: Netlabels began to branch out from the tracker scene when the MP3 file format became popular in the late 1990s, but most are still dedicated to electronic music and related genres though this is rapidly changing.
Split into simpler sentences: Netlabels began to branch out from the tracker scene when the MP3 file format became popular in the late 1990s. Most are still dedicated to electronic music and related genres, though this is rapidly changing.