Several people are on a shoreline that has a sign behind them.
A group of people are outdoors.
Several people and group of people  are synonyms. Outdoors refers to shoreline.
exists p1 s1 x1.(exists e1 x2 x3 x4.(on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & behind(x4,x1) & n_sign(x4) & (x2 = x3) & n_shoreline(x2)) & n_thing(x1) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 x2.(exists x3.((x1 = x3) & n_outdoors(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))