Complex sentence: The girls' gym class comes back into the building, and Hoshi flirtatiously confronts Tojo, now nursing a nosebleed, who denies all wrongdoing, but grins at the camera and displays a "V for Victory" once her back is turned.
Split into simpler sentences: The girls'gym class comes back into the building and Hoshi flirtatiously confronts Tojo, now nursing a nosebleed. He denies all wrongdoing but grins at the camera and displays a "V" for "victory" once Hoshi's back is turned.