Complex sentence: The Institution of Railway Signal Engineers, abbreviated to IRSE, is a Worldwideprofessional body for all those engaged or interested in railway signalling and telecommunications (S&T) and allied disciplines.
Split into simpler sentences: The Institution of Railway Signal Engineers, known more usually as the IRSE, is an international organisation, active throughout the world. It is the professional body for all those engaged or interested in railway signalling and telecommunications (S&T) and allied disciplines.