Complex sentence: On July 25,2007, Dale Earnhardt, Inc. announced it had acquired Ginn Racing, and Martin joined Dale Earnhardt, Jr., Martin Truex, Jr., and Paul Menard as a driver for DEI starting at the 2007 Allstate 400 at the Brickyard.
Split into simpler sentences: On July 25,2007, Dale Earnhardt, Inc. announced it had acquired Ginn Racing. Mark Martin would join Dale Earnhardt, Jr., Martin Truex, Jr., and Paul Menard as a driver for DEI starting at the 2007 Allstate 400 at the Brickyard.