The man with the backpack is sitting in a buildings courtyard in front of an art sculpture reading.
The man's backpack is full of guns and ammunition.
The backpack could be empty or only partly full.  Guns and ammunition may not be in the backpack.
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(n_backpack(x2) & n_man(x1) & in(e1,x5) & of(x5,x6) & n_reading(x6) & of(x6,x8) & n_sculpture(x8) & of(x6,x7) & n_art(x7) & n_front(x5) & in(e1,x3) & Time(x3,x4) & n_courtyard(x4) & n_building(x3) & Actor(e1,x1) & v_sit(e1) & with(x1,x2))
exists s1 x1 x2 x3 x4 x5.(n_backpack(x2) & of(x2,x1) & n_man(x1) & of(s1,x3) & n_ammunition(x5) & n_gun(x4) & subset_of(x5,x3) & subset_of(x4,x3) & Theme(s1,x2) & a_full(s1))