'jan ilo ni' adjectives to the right.
"friendship" = 'nasin pi jan pona'
Your illegit (ut nunc) 'pu' line reminds me of the other problem with rel clauses: RHE -- where the hell does one end. It would be possible in your case to take the 'li' there as a second predication on 'jan' The guy (BIRD!) who makes this robot and is a bad person to boot, .... And, of course, rel clauses in PPs and DOs are even worse.