A man in a colorful button-up t-shirt is pouring what appears to be barbecue sauce onto something.
Someone with a brightly colored shirt is pouring sauce
A man is someone and brightly colored implies colorful.
exists s1 x1 x2 x3.(exists e2 e1 p1 x4.(n_thing(x4) & Theme(e2,x4) & Actor(e2,x1) & v_pour(e2) & Topic(e1,p1) & Actor(e1,x4) & v_appear(e1) & exists p2 x5.(onto(p2,x5) & n_thing(x5) & exists s2 x6.((x4 = x6) & n_sauce(x6) & a_barbecue(s2) & Theme(s2,x6)))) & in(x1,x2) & n_t-shirt(x2) & of(x2,x3) & n_button-up(x3) & a_colorful(s1) & Theme(s1,x2) & n_man(x1))
exists e1 e2 x1 x2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_pour(e2) & n_sauce(x3) & with(x1,x2) & n_shirt(x2) & Theme(e1,x2) & v_color(e1) & r_brightly(x2) & n_person(x1))