Complex sentence: Having been formally commissioned she took passage from Halifax to Plymouth, travelling via St. Johns, Newfoundland, she arrived at Devonport Dockyard on 29 September and was taken in hand for modifications to fit her for service with the Royal Navy.
Split into simpler sentences: Having been formally commissioned she took passage from Halifax to Plymouth, travelling via St. Johns, Newfoundland. She arrived at Devonport Dockyard on 29 September and was taken in hand for modifications to fit her for service with the Royal Navy.