The problem I have with this interpretation is...
1. There is nothing to indicate in the Hebrew that the commas belong in those specific places. Where one chooses to place the commas makes a big difference in how a verse reads.
Yep, you have to remember that this is not the main trouble you are getting into. It’s not the Hebrew text, just leave it there. it is the English KJV as you seemed. And the English KJV has the correct translation from the Hebrew text and not according to some English versions that contradict themselves.
2. The verb "was" is not in the Hebrew. This is why it is written in italics in the verse.
That would be very flimsy for you to say it was not there because of the italics. The italics were placed to clear the reading. So, your italics have no weight to destroy the KJV. Without the “was” and the comma (,) the KJB would look like this
40Now the sojourning of the children of Israel who dwelt in Egypt four hundred and thirty years.
And you have the KJV contradicted itself but it didn’t happen that way on the text of the KJV so that your inference is entirely in error. The KJV translators knew too full well, understand, read Hebrew, Greek, Aramaic + many oriental languages than you do, I even myself is being doubtful if you really can read and write the Hebrew language.
With the comma and the "was" the last half of the verse reads:
...who dwelt in Egypt, was four hundred and thirty years.
...who dwelt in Egypt, was four hundred and thirty years.
This means to say, the Bible KJV does not contradict itself at all. I totally agree with Will Kenney as he stated:
The KJB says "the sojourning of the children of Israel was 430 years". The phrase "who dwelt in Egypt" is placed within commas and merely modifies the children of Israel, who at this time were in Egypt, as part of their whole sojourning history. The KJB does NOT say that they sojourned IN Egypt FOR 430 years, as some of the modern versions do.
So simply, you have to take your case, to those English versions that contradict themselves. But not with the KJV. It does not. The whole sojourning does not stop at Egypt, that is not what God promised to them. It was this time when Abraham left Haran to enter Canaan until the exodus from Egypt.
Without those it reads:
...who dwelt in Egypt four hundred and thirty years.
And you have all the dilemmas.