Complex sentence: Contemporaneously, the concept of "Empire" is politically valid, yet is not always used in the traditional sense; for example Japan is considered the world's sole remaining empire because of the continued presence of the Japanese Emperor in national politics.
Split into simpler sentences: Contemporaneously, the concept of "empire" is politically valid, yet is not always used in the traditional sense. For example, Japan is considered the world's sole remaining empire because of the continued presence of the Japanese Emperor in national politics.