Add spaces: Atthatpoint"thechildrenofIsrael"disappearfromhistoryandifpromisesmadetothemaretoberedeemed,thisredemptionmustevidentlybefromamongtheranksofmankind,inwhichtheybecameinvolvedandmerged.
At that point "the children of Israel" disappear from history and if promises made to them are to be redeemed, this redemption must evidently be from among the ranks of mankind, in which they became involved and merged.