The phrase "had relation" can be replaced with a variety of synonyms, depending on the intended meaning of the sentence. For example, one might substitute "related to" for a more succinct expression of the same idea, or "connected to" to emphasize the link between two things. "Relevant to" would be a good choice when discussing an idea or concept that is pertinent to a given situation, while "pertinent to" is similar in meaning but more formal. Other options might include "associated with," "entwined with," "linked to," "tied to," or "correlated with," all of which convey a sense of connection or interdependence.