Complex sentence: The success fee in England must be as a percentage no greater than 100% of the normal fee, provided this contrasts with the contingency fee in the USA which gives the successful attorney a percentage of the damages awarded in favor of his client.
Split into simpler sentences: The success fee in England must be as a percentage no greater than 100% of the normal fee. This contrasts with the contingency fee in the US, which gives the successful attorney a percentage of the damages awarded in favor of his client.