Not that we have the capability to "split" our frame, but when out riding the mountain tandem, the timing chain has come off. Usually on account of it picking up something to large to chop up.
Each time I've reinstalled it without loosening the eccentric, and the chain is run fairly tight.
One thing I am planning on getting done, is to put witness or reference marks on the two chainrings and in two places on the chain. I'll use two different color marks, one for captain and one for stoker. This will allow an easier get it back on where it was, in the least amount of time.
Just a thought that may also work for those that disassemble their ride and travel.
PK