Made so that / THERE IS vs I HAVE/ COMPARED vs in relation

MADE SO THAT

- These seats were made so that if you wanted to sit in any position you could...
- An unfortunate chain of events over the course of her life made it so that she's callous to people now.
- If you 're so good at massaging as to make me fall asleep I'll pay you.

THERE is vs I HAVE

- There is/I have a smaller age difference between my nefew than my brother.
- THere is/ I have no doubt that's true.

COMPARED vs IN RELATION

- How many hour difference are there between LA and NY?/
- How many hours ahead is LA than/compared/in relation to NY. (how do you say this?)

Can you tell mwhat you think of this please?

- Could you get back to me regarding the shipment and why there's been a problem with it. Why has it taken so long?/why is it taking so long?

Thank you