$(function(){

  $("p.description").each(function(){
    var text = $(this).html();
    var halfText = Math.round(text.length * 7/12);
    halfText = text.indexOf(". ", halfText) + 1;
    var paragraph_1 = text.substring(0,halfText);
    var paragraph_2 = text.substring(halfText);
    if (halfText != 0) 
    {
      $(this).html(paragraph_1);
      $(this).after('<p class="description par_2">' + paragraph_2 + '</p>');
    }
    });

});