Complex sentence: On October 15,2007 ETS (the Educational Testing Service), the world's largest educational research and assessment organization, finalized the acquisition of Thompson Prometric and its global network of testing centers in 135 countries, from The Thomson Corporation for $435 million.
Split into simpler sentences: On October 15,2007, Educational Testing Service (ETS), the world leader in educational research and assessment, finalized acquisition of Thomson's Prometric. Thompson sold the global network of testing centers in 135 countries, for a reported $435 million.