Complex sentence: Until the late 1980s, peak-hour trains on the Preston-Ormskirk line continued to cross at Rufford station, but the service was further reduced, leaving the branchline to be operated by a single DMU running essentially along a long siding.
Split into simpler sentences: Until the late 1980s, peak-hour trains on the Preston-Ormskirk line continued to cross at Rufford station. GB National Rail Timetable May 1987 Edition, Table 99 Thereafter the timetable was further reduced, leaving the branch line to be operated by a single DMU running essentially along a long siding.