Simplify the following text for a Grade 7 native English-speaking person.
Original: Wikio was founded by Pierre Chappaz , who had previously developed the price comparison service Kelkoo which was sold to Yahoo in 2004 . Wikio News and the firms Ebuzzing , Nomao , OverBlog , Wikio Buzz and Wikio Experts form the Wikio Group .
Simplified: Wikio is a European search engine developed by Pierre Chappaz .