Complex sentence: Google Glass is a wearable computer with an optical head-mounted display (OHMD) that is being developed by Google in the Project Glass research and development project, with a mission of producing a mass-market ubiquitous computer.
Split into simpler sentences: Google Glass is a wearable computer with an optical head-mounted display (OHMD). It was developed by Google research and development project, with the mission of producing a mass-market ubiquitous computer.