Original sentence: Berberine is considered an ineffective antibiotic, but a minority claim that when not tested in isolation but in conjunction with the other biochemical substances from the barberry plant, then berberine is effective
Edited sentence: Berberine is considered an ineffective antibiotic, but a minority claim that when not tested in isolation but in conjunction with the other biochemical substances from the barberry plant, then berberine is indeed an effective antibiotic