Complex sentence: Some of the disciplines are similar to those in powerlifting and some powerlifters have also successfully competed in strongman, however strongman also tests physical endurance to a degree not found in powerlifting or other strength-based sports.
Split into simpler sentences: Some of the disciplines are similar to those in powerlifting and some powerlifters have also successfully competed in strongman competitions. However, strongman events also test physical endurance to a degree not found in powerlifting or other strength-based sports.