Complex sentence: Eggsy and Merlin are briefed by Statesman head Champagne about a secret terrorist organisation called The Golden Circle, but when Statesman agent Tequila develops a strange blue rash, he is replaced by agent Whiskey as Eggsy's partner.
Split into simpler sentences: Eggsy and Merlin are briefed by Statesman head Champagne about a secret terrorist organisation called The Golden Circle. When Statesman agent Tequila develops blue rashes, he is replaced by agent Whiskey as Eggsy's partner.