Complex sentence: His first act was to introduce a coach whom he met whilst on FA duty at the 1936 Berlin Olympics, Jimmy Hogan, who led Villa to the Second Division championship in 1937/38.
Split into simpler sentences: His first act was to introduce a coach whom he met whilst on FA duty at the 1936 Berlin Olympics, Jimmy Hogan. This was the man who led Villa to the Second Division championship in 1937/38.