【Butrecently,manyhistorianshavebeguntofocusontherolesslaveryplayedinthelivesofthefoundinggeneration.playedinthelivesofthefoundinggeneration.是过去分词作定语吗?therolesslavery翻译过来是作用的奴隶制度怎】

　　Butrecently,manyhistorianshavebeguntofocusontherolesslaveryplayedin

　　thelivesofthefoundinggeneration.playedinthelivesofthefoundinggeneration.是过去分词作定语吗?therolesslavery翻译过来是作用的奴隶制度怎么总感觉不太通顺?应该是奴隶制度的作用才对啊?