I lost sight of Wangping because of too many carriages flyin

ecause和because of because是连词,其后接原因状语从句或回答以why开头的问句； 而because of是复合介词,其后接名词、代词或动名词,或者what引导的名词性从句. 摘自百度
再问： 这些我都懂，我是说那个of后面应该得是短语，可却是句子，但老师说是个什么名词什么的...
再答： 、because从句与 because of短语的转换 Because引导的原因状语从句有时可与because of 短语转换，because of后加的原因可以为好或坏 但最正规的还是because　He can’t come because he is ill. / He can’t come because of his illness. 他因病不能来。 I said nothing about it because his wife was there. / I said nothing about it because of his wife’s being there. 因为他妻子在那儿，我对此事只字未提。
再答： because of 后面接的是一种现象！而because 则是描述这个想象的发生！
再问： 那是不是在flying前加is就可以用because了？
再答： NO ! 后面部分的主语不是too many carriages 应该是there are ~~~（因为）哪儿有 、、、 flying by in all directions 只不过是宾补。 而because of的意思应该是（、、、的原因是）