Complex sentence: Emperor Wu then reinforced this strategic asset by establishing five commanderies and constructing a length of fortified wall along the border of the Hexi Corridor, colonized the area with 700,000 Chinese soldier-settlers.
Split into simpler sentences: Emperor Wu then reinforced this strategic asset by establishing five commanderies and constructing a length of fortified wall along the border of the Hexi Corridor. He colonised the area with 700,000 Chinese soldier-settlers.