Lady doing chemistry work while the man in long-sleeve shirt observes her.
A lady is doing research in the lab while a man watches
Chemistry is a form of research, and watches is a synonym of observes.
exists e1 p1 x1 x4.(n_man(x4) & exists e2 p2 x2 x3.(exists e3 s1 x5.(Theme(e3,x1) & Actor(e3,x4) & v_observe(e3) & in(x4,x5) & n_shirt(x5) & a_long-sleeve(s1) & Theme(s1,x5)) & while(e2,p2) & Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & n_work(x2) & of(x2,x3) & n_chemistry(x3)) & n_female(x1) & Topic(e1,p1) & Actor(e1,x1) & v_lady(e1) & n_thing(x1))
exists e1 p1 x1 x2 x3.(n_lab(x3) & exists e2 x4.(Actor(e2,x4) & v_watch(e2) & n_man(x4)) & while(e1,p1) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_research(x2) & n_lady(x1))