Complex sentence: Virology is the research field and body of knowledge concerning viruses and and sometimes virus-like entities, more specifically their structure, classification, evolution, interactions with host cells, interactions with host immunity, and effects on host anatomy and physiology, namely phenotype.
Split into simpler sentences: Virology is the research field and body of knowledge concerning viruses and virus-like entities. Virology describes their structure, classification, evolution, interactions with host cells, interactions with host immunity, and effects on host anatomy and physiology, namely phenotype.