Complex sentence: However, becoming a cadet excluded Archer-Shee from civil trial, and he had not reached the status for court-martial, so Carson resorted to an archaic legal device called a petition of right against the Crown to bring the matter before the courts.
Split into simpler sentences: However, becoming a cadet excluded Archer-Shee from civil trial, but he had not reached the status for court-martial. So Carson resorted to an archaic legal device called a petition of right against the Crown to bring the matter before the courts.