Complex sentence: In the Great Miami River Valley, 360 persons died, about 200 of those in Hamilton, some drowned, some were washed away and never found, others died from various diseases and complications, and some committed suicide because of severe losses.
Split into simpler sentences: In the Great Miami River Valley, 360 persons died, about 200 of whom were from Hamilton. Some drowned, some were washed away and never found, others died from various diseases and complications, and some committed suicide because of severe losses.