Complex sentence: He has stated in the Rickenbacker Forum that he used H&H amplification for this recording, notably a bass combo, and also Rotosound roundwound strings to produce his benchmark sound.
Split into simpler sentences: He has stated in the Rickenbacker Forum that he used H&H amplification for this recording, specifically a H&H bass combo. He used Rotosound roundwound strings to produce his benchmark sound.