【英语句子结构问题:Therehasbeenarelationship...Therehasbeenarelationshipbetweenhumanbeingsandsuchanimalshavebecomeacommonandessentialpartofpeople'sdailylife.,...betweenhumanbeingsandsuchanimals这一句完了不是】

　　英语句子结构问题:Therehasbeenarelationship...

　　Therehasbeenarelationshipbetweenhumanbeingsandsuchanimalshavebecomeacommonandessentialpartofpeople'sdailylife.

　　,...betweenhumanbeingsandsuchanimals这一句完了不是就结束了么,怎么后边还有havebecomeacommonandessentialpartofpeople'sdailylife.还是说这是两个句子,如果是两个句子的话,betweenhumanbeings,这样就说不通了.

　　请问下怎么断句?