Complex sentence: The project was led by Udi Manber, a Google vice president of engineering; it was announced on December 13,2007, and was opened in beta version on July 23,2008, with a few hundred articles, mostly in the health and medical field.
Split into simpler sentences: The project was led by Udi Manber, a Google vice president of engineering. It was announced on December 13,2007, and was opened in beta version on July 23,2008, with a few hundred articles, mostly in the health and medical field.