Yahoo! Inc. is rolling out a souped-up search engine Monday in a bid to supplant its business partner, Google, as the most popular place to find things on the Internet. With the revisions, Yahoo! believes its search engine will provide more useful information than Google’s and be simpler to use. The rebuilt version will combine Google’s index with Yahoo!’s customized services spanning sports, driving directions and weather reports. “We think this is going to change the game a bit,” said Jeff Weiner, Yahoo!’s senior vice president of search and marketplace. “This is the first of many steps toward reinforcing our leadership in the marketplace.” Google declined to comment on Yahoo!’s new search engine. Battle lines clearly are being drawn between the companies, said Danny Sullivan, editor of the industry newsletter Search Engine Watch. “They are going to be duking it out,” Sullivan predicted. “Clearly, Yahoo! would like to keep more people from going over to Google to search and maybe even bring back some of the people that have previously left.” Full Story