Complex sentence: During this visit, the hospital reported his symptoms were a fever, abdominal pain for two days, a headache, and decreased urination; and that he had no vomiting, diarrhea, or nausea at the time.
Split into simpler sentences: During this visit, his reported symptoms were a fever, abdominal pain for two days, a headache, and decreased urination. He reported he had no vomiting, diarrhea, or nausea at the time.