Complex sentence: He also covered the retreat of the British forces in Burma and was probably the only British war reporter/photographer to be allowed to write a story on the Burma Road by travelling on it into China, with special permission from the Chinese military.
Split into simpler sentences: He also covered the retreat of the British forces in Burma. He was probably the only British war reporter/photographer allowed to write a story on the Burma Road by travelling on it into China, with special permission from the Chinese military.