Complex sentence: Arguably the song with the most progressive rock influence in this album (à la Genesis), "Colours" did not see much commercial success as it is almost nine minutes long and radio stations had no interest in playing it.
Split into simpler sentences: Arguably the song with the most progressive rock influence in this album (à la Genesis). But it did not see much commercial success as it is almost nine minutes long, and radio stations had no interest in playing it.