Complex sentence: At the age of four weeks, Raun had an ear infection that was treated with antibiotics, which caused severe dehydration and a several-day hospital stay; doctors feared Raun would suffer permanent hearing loss.
Split into simpler sentences: At the age of only four weeks, Raun had an ear infection which was treated with antibiotics. These caused severe dehydration and a several-day hospital stay; doctors even feared Raun would suffer permanent hearing loss.