Simplify the following text for a Grade 12 native English-speaking person.
Original: The British Commander-in-Chief in India ( or Commander-in-Chief of India ) was the chief military commander for the British administration in India and liaisoned with the civilian Governor-General of India .
Simplified: The British Commander-in-Chief in India ( or Commander-in-Chief of India ) was the chief military commander of the British administration in India .