Complex sentence: Live attenuated influenza vaccine (LAIV) is administered intranasally PMID 17301299, while inactivated vaccine is administered by intramuscular injection.
Split into simpler sentences: Live attenuated influenza vaccine (LAIV) is a type of influenza vaccine. LAIV is administered intranasally PMID 17301299, while inactivated vaccine is administered by intramuscular injection.