Complex sentence: The highest deities of the state were closely identified with its senior officials, whose had priestly as well as administrative or military duties; any important state function or battle required an act of sacrifice, prescribed and correctly performed, to secure divine good will.
Split into simpler sentences: The highest deities and priesthoods of the state were closely identified with its senior officials, whose administrative or military duties carried certain religious obligations. Important state functions or battle required an act of sacrifice, prescribed and correctly performed, to secure divine good will.