Complex sentence: He later rejoined Zhang Zuolin and served as his Minister of War in the Beiyang Government from May 1926 to June 1927 and as Minister of Enterprises from June 1927 to June 1928.
Split into simpler sentences: He later rejoined Zhang Zuolin and served as his Minister of War in the Beiyang Government from May 1926 to June 1927. He then served as Minister of Enterprises in the Beiyang Government from June 1927 to June 1928.