Complex sentence: Harley's first concern was to find £300,000 for the next quarter's pay for the British army operating in Europe under Marlborough, which was provided by a private consortium of Edward Gibbon, George Caswall and Hoare's bank.
Split into simpler sentences: Harley's first concern was to find £300,000 for the next quarter's pay for the British army operating in Europe under Marlborough. This was provided by a private consortium of Edward Gibbon, George Caswall and Hoare's bank.