var lineSplit = function(str, lines){
	lines = lines || 3;
	var strArr = str.split(" "),
		cropSize = Math.ceil(strArr.length / lines),
		splitted = [];
	while(strArr.length){
		splitted.push(strArr.splice(0, cropSize).join(" "));
	}
	return splitted;
};

Parameters: required **[string]**, optional **[number of lines]**.     
 
By default it breaks the string passed into 3 lines.    
  
It takes a string and converts it to an array of strings, splitting the original string into smaller parts (useful for word breaking).

Word breaker (or how to split a string into lines)

JavaScript