Complex sentence: It should be noted that Ruth adopted the God of Naomi, her Israelite mother-in-law, and chose to go back to her (Naomi's) people after her husband, his brother and his father, Naomi's husband, died.
Split into simpler sentences: It should be noted that Ruth adopted the God of Naomi, her Israelite mother-in-law. Ruth chose to go back to her (Naomi's) people after her husband, his brother and his father, Naomi's husband, died.