Complex sentence: Relations improved exponentially following this period, as bilateral ties between the two nations improved once again, to the point where the Japanese prime minister, Shinzo Abe was to be the chief guest at India's 2014 Republic Day parade.
Split into simpler sentences: Relations improved exponentially following this period, as bilateral ties between the two nations improved once again. To the point where the Japanese prime minister, Shinzo Abe was to be the chief guest at India's 2014 Republic Day parade.