A group of children are playing while waiting for the bus.
Some kids together.
"A group of children" is a rephrasing of kids.
exists e1 e2 x1 x2 x3.(n_bus(x3) & while(e1,e2) & for(e2,x3) & Actor(e2,x1) & v_wait(e2) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists s1 x1.(Theme(s1,x1) & a_together(s1) & n_kid(x1))