Complex sentence: It is an update to the Jerusalem Bible, an English version of the French Bible de Jérusalem; however, the Jerusalem Bible was not a translation from the French, rather it is an original translation heavily influenced by the French.
Split into simpler sentences: It is an update to the Jerusalem Bible, an English version of the French Bible de Jérusalem. However, the Jerusalem Bible was not a translation from the French; rather, it is an original translation heavily influenced by the French.