Complex sentence: The metre was redefined yet again in 1983 by CGPM in terms of the speed of light as-the metre is the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.
Split into simpler sentences: The metre was redefined yet again in 1983 in terms of the speed of light. Again it was defined as-the metre is the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.