A sailing boat with many people sails on water.
There are people on a boat.
A sailing boat is less specifically referred to as a boat, the people are also rephrased and the number taken away. This is a very vague restatement.
exists x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x3) & on(x3,x5) & n_water(x5) & Time(x3,x4) & n_sail(x4) & n_people(x3) & n_quantity(x3) & n_boat(x1) & of(x1,x2) & n_sailing(x2))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_boat(x3) & n_people(x2))