什么是run-onsentenceObviously,theproblemofgreenhouseeffectisoneofthebiggestproblemsthathadmanybigconferencesbetweencountriestodiscussedittoday,themovieisjustmagnifyingtheeffectofthisprobleminordertoleadthereaso

　　什么是run-onsentence

　　Obviously,theproblemofgreenhouseeffectisoneofthebiggestproblemsthathadmanybigconferencesbetweencountriestodiscussedittoday,themovieisjustmagnifyingtheeffectofthisprobleminordertoleadthereasonofthisclimedisastermorebelievable.

　　Moreover,beforethemaincatastrophehappenedinTHEDAYAFTERTOMORROWtherearemanysmalldisastersappearedinthemovie,likehailandcyclonewhichcouldbeseeninthenormallife,thatletthestorymoreclosedtopeople’sexperienceandgivetheaudiencemoresoulshockthan2012.

　　In2012,thecommunicationbetweenthepeopleisnotenough,themainactioninthisstoryisjustrun---runonfoot,runbycar,runbyplaneandatlastrunbyahugeship.

　　请问这几句有什么问题,老师说我是run-onsentence.但我没看出具体的问题在哪,要怎么修改呢?