Oh sure, I am the in-house RigVeda expert.I can explain it quite easily. If you have more questions, kindly feel free to check with me.
There are real contradictions in Vedas. For example, the Hiranyagrbha Sukta says that the Supreme God arose out of a golden Egg, Nasadiya Sukta says Gods arose after creation of the world. But this is natural. RigVeda hymns were written by more than a thousand rishis and rishikas (ladies) and every one did not have the same views.
I referred to my great-grandfather in fun, but it is true that my progenitor, the sage whose name my family carries, Upamanyu, wrote part of one hymn in RigVeda. Upamanyu was in the line of Sage Vasishtha and a whole book of RigVeda consists of hymns written by the Vasishthas, that is, book number 7.
https://en.wikipedia.org/wiki/Rigveda#Rishis
Vedas are a compilation. All known hymns gathered together, old and those which were composed in various later times (perhaps till around 1000 BC). It has not been edited. The compilers generally went by the name of the family to whom the rishi belonged. Furthermore, the hymns are not arranged chronologically because no one knew when the hymns were composed. So each book contains older as well as newer hymns.
There is nothing new in what I am saying. If anyone goes through Wikipedia pages on Vedas, all this information is available there.
There has been no break either in the Vedic or the indigenous traditions of Hinduism. Both have chugged along together since times immemorial.
