Complex sentence: DeHaan established a country practice in Byron Center, Michigan, about fourteen miles east of his home town, and he was frequently pushed near exhaustion, at no time more so than during the 1918 flu pandemic when for five days he never took off his clothes.
Split into simpler sentences: DeHaan established a country practice in Byron Center, Michigan, about fourteen miles east of his home town. The practice frequently pushed him near exhaustion, at no time more so than during the 1918 flu pandemic, when for five days he never took off his clothes.