Complex sentence: After working at ATR in Japan and the University of Edinburgh, he took a research faculty position at Carnegie Mellon in 1999; in 2008 he became a regular faculty member with tenure at CMU.
Split into simpler sentences: After working at ATR in Japan and the University of Edinburgh, he took a research faculty position at Carnegie Mellon in 1999. In 2008 he became a regular faculty member with tenure at CMU.