.

English term (edited): Fragen 1 + 2

"eigentlich selbstverständlich" ist ganz besonders bei Geld etwas deutlich Anderes als "ausdrücklich vereinbart".

Da hier aus dem Zusammenhang hervorgeht, dass die Initiative zum Umzug des Angestellten von der Firma ausgeht, ist es eigentlich selbstverständlich. (Wenn es aber die Initiative des Angestellten wäre, der den Ort wechseln möchte ohne den Arbeitgeber zu wechseln, wäre es nicht selbstverständlich.)

The more I think about this the more confused I get - and, as it is presumably important to get this right, it might be worth checking up on with the client.

One possibility is that "at the expense of" relates to remunerate and simply means that it is the company which is doing the remunerating. In other words "you will be remunerated by the company" - but then why didn't they say this in the first place.

If "at the expense of" relates to "return", it could mean that the company will remunerate you for your "return" as well as for your 3-month notice period. In other words, it could be a way of saying that the company will pay the costs of your return (travel etc.) as well as the ordinary salary.

What is "the period required to organize the return of yourself and your family"? I would have expected it to be the 3-month notice period, but using the different phrase seems to imply that some other arrangement is possible.

And "remunerate" is itself unclear, because it carefully doesn't say "remunerate at the usual rate" - so there's no promise there that it will actually be your normal salary (so, in answer to your question 1, it isn't actually a promise that the normal Gehalt will be weitergezahlt)

Clear as mud to me - but perhaps it's crystal clear to somebody else.

Es geht in erster Linie darum, dass der Versetzte während der Umstellungen zwischen den Gesellschaften zahlungsfähig bleibt; dass das Gehalt normalerweise weiterbezahlt wird, davon gehe ich hier aus, es ist nicht der Punkt um den es geht.
Diese Renumeration besteht in der Regel aus Barvorschüssen oder Zahlungen auf sein Konto von dem Lebensunterhalt, Miete, Fahrtkosten, Umzugskosten u.ä. bezahlt.

1. The company states that they will give him 3 months advance notice of his repatriation - that does not mean he is given 3 months to pack up and move, only that he has advance notice to get a headstart. During the actual move he is obviously not able to work but will be paid anyway. There is no mention of the actual time he will be given to relocate, so that may either follow later on in your context, or is subject to negotiation.