Complex sentence: Gretna and Eastriggs were built to house the workforce, and many were accommodated nearby in Carlisle, At Carlisle, when 5000 workers arrived back by train one publican had 1000 whiskies lined up !
Split into simpler sentences: Gretna and Eastriggs were built to house the workforce, and many were accommodated nearby in Carlisle. When 5000 workers arrived back by train to Carlisle, one publican had 1000 whiskies lined up!