Complex sentence: Following his school days Dove became a medical research student at Cambridge, whilst studying there he celebrated his 21st birthday with a visit to the Guerlain Boutique on the Champs-Elysées.
Split into simpler sentences: Following his school days Dove became a medical research student at Cambridge. Whilst studying there he celebrated his 21st birthday with a visit to the Guerlain Boutique on the Champs-Elysées.