Complex sentence: The term "Son of God" likewise had a specific Jewish meaning, or range of meanings, one of the most significant being the earthly king adopted by God as his son at his enthronement, legitimising his rule over Israel.
Split into simpler sentences: The term "Son of God" likewise had a specific Jewish meaning, or range of meanings. One of the most significant of these was the king at his enthronement, adopted by God as his son, the act legitimising his rule over Israel.