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JavaScript

var s="Hello everyone on stackoverflow"
//var y="<html><head><head><body><div>Hello<span>everyone</span>on stackoverflow</div></body></html>"
var s_split = s.split(' ');
var y = '<html><head></head><body><div>' + s_split[0] + '<span>' + s_split[1] + '</span>' + s_split[2]+' ' + s_split[3] + '</div></body></html>';

console.log(y);