Complex sentence: Clifton is a Franco-Belgian comics book series about the exploits of "Colonel Sir Harold Wilberforce Clifton", a British colonel, retired from MI6, and sometimes still active for the British government.
Split into simpler sentences: Clifton is a Franco-Belgian comics book series about "Colonel Sir Harold Wilberforce Clifton". He is a British colonel, retired from MI6, and sometimes still active for the British government.