A man in a yellow and red shirt is operating machinery.
A man in a yellow and red shirt is operating machinery as he chats with coworkers
There is nothing to indicate that he is chatting with coworkers.
exists p1 s1 s2 x1 x2.(exists e1 x3.((x1 = x3) & n_machinery(x3) & Actor(e1,x3) & v_operate(e1)) & in(x1,x2) & n_shirt(x2) & a_red(s2) & Theme(s2,x2) & a_yellow(s1) & Theme(s1,x2) & n_man(x1))
exists e1 p1 s1 s2 x1 x2 x3.(exists e2 x4.(with(e2,x4) & n_coworker(x4) & Actor(e2,x1) & v_chat(e2)) & n_male(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_operate(e1) & n_machinery(x3) & in(x1,x2) & n_shirt(x2) & a_red(s2) & Theme(s2,x2) & a_yellow(s1) & Theme(s1,x2) & n_man(x1))