Complex sentence: The Cheema tribe was designated by the British as a martial race this being a two-category classification system that administratively separated the physically more developed and active ethnic groups from those of a more sedentary nature.
Split into simpler sentences: The Cheema tribe was designated by the British as a martial race. British had an two-category classification system that administratively separated the physically more developed and active ethnic groups from those of a more sedentary nature.