Chances are that when you tell jokes of your own to the group, you will keep your topics well within the borders defined by the jokes you have heard told by your colleagues.
이 문장에서 within the borders 이하에서 defined by the jokes you have heard 까지는 알겠어요.
근데 그 다음 told by your colleagues가 어찌 되는지... ㅠㅠ
told by your colleagues도 jokes를 설명해주는 건데 you have heard 다음에 바로 told by your colleagues라고 올 수 있는 건가요?