A man dressed in a survival vest is speaking to a group of adult men.
A survivalist talking to men.
If a man is dressed in a survival vest it is implied that he is a survivalist. "Speaking" and "talking" are two words that mean the same thing.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(to(e2,x5) & of(x5,x6) & n_man(x6) & a_adult(s1) & Theme(s1,x6) & n_group(x5) & Actor(e2,x1) & v_speak(e2) & in(e1,x3) & n_vest(x3) & of(x3,x4) & n_survival(x4) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & to(e1,x3) & n_man(x3) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_survivalist(x1))