Complex sentence: Then in 1884-1885, Karoly Budinsky described in his article, "About Gymnastic Activity and the Development of Will", that people can help their self-control and willpower grow by making the nervous system stronger through physical exercise.
Split into simpler sentences: Then in 1884-1885, Karoly Budinsky wrote an article called "About Gymnastic Activity and the Development of Will". The article talked about how people can help their self-control and willpower grow by making the nervous system stronger through physical exercise.