[yom]

One solution is to cut the string is smaller parts and join those parts together with format:

pawn Код:

new s1[] = "first part of the looooooooooooooong string";
new s2[] = "second part of the loooooooooooong string";
    
new s[1024];
format(s, sizeof s, "%s%s", s1, s2);

ShowPlayerDialog(playerid,10,DIALOG_STYLE_MSGBOX,"Server Rules:",s,"Agree","Disagree");

Another solution is to put the long string in a text file and fread it. You choose.