grammar - Passive + that + v3?


I've just seen a sentence like the one below and couldn't understand its grammar.



  • Three controlled animal clinical trials were found that supported the use of decortication prior to performing GBR.


And I couldn't understand the usage of "to" in the sentence below.



  • The literature addressing the capacity of decortication to affect only grafting or wound healing also provided mixed results.


Can someone please explain to me what kind of sentences they are?


Thanks!!




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