【请教各位英文达人考研长难句!withthousandsofcareer-relatedsitesontheinternet,Findingpromisingopeningscanbetime-consumingandinefficient...workingwithapersonalsearchagentmeanshavinganotersetofeyeslookingoutforyou】

　　请教各位英文达人考研长难句!

　　withthousandsofcareer-relatedsitesontheinternet,Findingpromisingopeningscanbetime-consumingandinefficient...workingwithapersonalsearchagentmeanshavinganotersetofeyeslookingoutforyou.有谁能帮我分析一下workingwithapersonalsearchagentmeanshavinganotersetofeyeslookingoutforyou.为什么此句中可以出面两个动名词having和looking,lookingoutforyou在最后一句中做什么成分,修饰那个词!