Complex sentence: The spring of 229 saw Zhuge Liang make his third expedition, the objective of this particular campaign remained dubious, but he set the immediate goal as the capture of the commanderies of Wudu and Yinping for his vanguard, Chen Shi.
Split into simpler sentences: The spring of 229 saw Zhuge Liang make his third expedition. Though the objective of this particular campaign remained dubious, he set the immediate goal as the capture of the commanderies of Wudu and Yinping for his vanguard, Chen Shi.