Complex sentence: Warwick, pp.140--142 The number of her official engagements increased, which included a tour of Italy, Switzerland and France, and she joined a growing number of charitable organisations as President or Patron.
Split into simpler sentences: Warwick, pp.140--142 The number of her official engagements increased, which included a tour of Italy, Switzerland and France. Margaret joined a growing number of charitable organisations as President or Patron.