Complex sentence: Their introduction in Konami's session simulation was WE ARE in Guitar Freaks 11th Mix & DrumMania 10th Mix. In beatmania IIDX 10th style, they were introduced into the DJ simulation series with the song DoLL.
Split into simpler sentences: Their introduction in Konami's session simulation was WE ARE in GuitarFreaks11/DrumMania 10. In beatmaniaIIDX 10th style, they were introduced into the DJ simulation series with the song DoLL.