Complex sentence: The majority of the Wirral Line has a loading gauge of W6 and it has a Route Availability (RA) of RA 8 except for the New Brighton branch which is RA 6, making whole line fairly restrictive and not very attractive for freight traffic.
Split into simpler sentences: The majority of the track has a loading gauge of W6 and the line has a Route Availability (RA) of RA 8 except for the New Brighton branch which is RA 6. This makes the whole line fairly restrictive and not very attractive for freight traffic.