I'm thinking the sentence was drafted, then rewritten, but not proofread. It could read:
"...gives you together with our employees the 100% certainty ON WHICH you are free to build up your promises..."
or, "...gives you together with our employees the 100% certainty for the _?_?_?_" ...I don't know what was meant to go here. I think Kayleigh's comment clears up a lot of mystery.
As for the other example, here's how I read it:
"...displays the port number on the system for the "on", which the tool command is used ..." (I'm not even sure of that makes sense... I don't know what an "on" is supposed to be.)