Complex sentence: It represents over 90,000 railway workers all over in Pakistan.It is the affiliate of International Transport Workers Federation London, which is the International Federation, representing more than 148 countries in different categories of transport.
Split into simpler sentences: It represents over 90,000 railway workers all over in Pakistan. Railway Worker's Union is the part of International Transport Workers Federation London, which is the International Federation, representing more than 148 countries in different categories of transport.