a man sitting and looking at his phone.
A businessman sits on a bench and reads work email on his iphone.
Not all men are a businessman.  There is nothing to indicate he is sitting on a bench reading email.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & at(e2,x4) & n_phone(x4) & of(x4,x1) & n_male(x1) & Actor(e2,x3) & v_look(e2) & (x1 = x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 e2 x1 x2 x3 x4 x5 x6.(Theme(e2,x4) & Actor(e2,x3) & v_read(e2) & on(x4,x6) & n_iphone(x6) & of(x6,x1) & n_male(x1) & n_email(x4) & of(x4,x5) & n_work(x5) & n_businessman(x3) & on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_businessman(x1))