Complex sentence: IBM released the regular Model M and Space Saving Keyboard Model M in an alternative'grey/pebble' colour for use with their industrial computers: differences included a grounded space bar and (sometimes on later models) drainage holes to accommodate harsh environments.
Split into simpler sentences: IBM released the regular Model M and Space Saving Keyboard Model M in an alternative'gray/pebble' colour for use with their industrial computers. Other differences included a grounded spacebar and (sometimes on later models) drainage holes to accommodate harsh environments.