Most of the motorway was opened between 1959 and 1968 but the southern end was extended in 1977 and the northern end was extended in 1999.
Some of the motorway was opened in 1959.Other sections opened between 1965 and 1968.Two extensions were opened in 1977 and 1999.
Some of the motorway was opened in 1959.Other sections opened between 1965 and 1968.Two extensions were opened in 1977 and 1999.
Rewrite this with simpler wording: Most of the motorway was opened between 1959 and 1968 but the southern end was extended in 1977 and the northern end was extended in 1999. Output: