Complex sentence: It combined a B-215 dual 15-in bass horn, a MR102 12-in mid-bass horn and a Community BRH90 HF horn into one gigantic box, and was the first commercially available horn-loaded one box system.
Split into simpler sentences: It combined a B-215 dual 15-in bass horn, a MR102 12-in mid-bass horn and a Community BRH90 HF horn into one gigantic box. It was the first commercially available horn-loaded one box system.