Complex sentence: Eventualy, Lysimachus being set free and offered lavish gifts, the peace between the Getae and Lysimachus was strenghtened further by the marriage between Dromichaetes and Lysimachus' daughter.
Split into simpler sentences: Eventualy, Lysimachus was set free and offered lavish gifts, establishing a peaceful relationship. The peace between the Getae and Lysimachus was strenghtened further by the marriage between Dromichaetes and Lysimachus' daughter.