Complex sentence: He also became interested in workplace safety and employer relations; becoming President of the British Safety Council and of the British Employers' Confederation (1958--60; in 1965 it formed the Confederation of British Industries).
Split into simpler sentences: He also became interested in workplace safety and employer relations; he became President of the British Safety Council. He was President of the British Employers' Confederation (1958--60; in 1965 it formed the Confederation of British Industries).