> Once life began,however,it is clear (that evolutionary processes
                           S  V   C    実主語はthat移行
> took over and resulted in the great diversity of life (we now have 
   v1              v2                               関係代名詞省略
on our planet.))
> どう訳し始めたらいいものか(;´Д`)


構文はこんな感じだと思う

参考：2002/05/12(日)21時37分28秒