I need a 30-pin (iPhone 4) to Lightning (iPhone 5) with a long cable (1m) between the 2 ends.
Does such thing exist?
Apple sells a Lightning to 30-pin adapter.
If you're okay with 3rd-party solution, 30-pin female to Lightning adapter could be closer to what you need, but there could be compatibility issues.
The kit includes this:
to which you can add Lightning 1m-extension cable which should get you from Lightning to 30-pin.
As far as I can see there is no single cable that does what you want.