man with guitar on stage drinking a can drink.
A man drinking a canned drink.
The man is drinking a can drink is what sentence 1 says minus the description.
exists e1 p1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x2) & on(x2,x3) & exists e2 x6.(Theme(e2,x6) & Actor(e2,x5) & v_drink(e2) & (x3 = x6)) & Topic(e1,p1) & Actor(e1,x5) & v_can(e1) & n_a(x5) & n_drinking(x3) & of(x3,x4) & n_stage(x4) & n_guitar(x2) & n_man(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_drink(e1) & n_drink(x3) & a_canned(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))