A man talking to a woman while he is holding her arm on a street at night.
a man and a women are holding hands at night
The second sentence is inferring affection, vaguely using the details provided in sentence one. Her hand is on her arm, so it's possible, though not said. The man is holding the woman but while a hand is part of an arm, that was not mentioned in the first sentence.
exists e1 p1 x1 x2 x3 x4.(a_topic(x1) & exists e2 x5 x6.(at(e2,x6) & n_night(x6) & Theme(e2,x4) & Actor(e2,x1) & v_hold(e2) & on(x4,x5) & n_street(x5)) & n_arm(x4) & of(x4,x1) & n_female(x1) & n_male(x1) & while(e1,p1) & to(e1,x3) & n_woman(x3) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4 x5.(at(e1,x5) & n_night(x5) & Theme(e1,x4) & Actor(e1,x1) & v_hold(e1) & n_hand(x4) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))