That’s called a “cable gland” in English by the way.
So… you are asking how to get a cable through a cable gland without removing the connectors that are already mounted on the cable? Not gonna happen unless the connectors are only trivially thicker than the cable itself.
I’m not aware of any cable glands that come apart into halves, but maybe it exists, or you could 3D print one, or turn one on a lathe, split it lengthwise, and use sealant to close the gaps.
I just googled and they do exist. Search for “split cable gland”.
Another option I can think of is to cut the cable apart and attach a weatherproof sealed connector to it, with the mating connector on your enclosure.