Complex sentence: In August 1914 before the start of the First World War there were fifty-five yeomanry regiments, these together with the thirty-one regular cavalry regiments and three regiments of horse part of the Special Reserve, formed the mounted troops of the British Army.
Split into simpler sentences: In August 1914 before the start of the First World War there were fifty-five yeomanry regiments. Together with the thirty-one regular cavalry regiments and three regiments of horse part of the Special Reserve, these formed the mounted troops of the British Army.