Complex sentence: A study showed that 29 of 30 patients with DIL were slow acetylators and that slow acetylators had more hydralazine metabolites in their urine than fast acetylators (Lahita 859).
Split into simpler sentences: A study showed that 29 of 30 patients with DIL were slow acetylators. In addition, these patients had more hydralazine metabolites in their urine than fast acetylators (Lahita 859).