Complex sentence: While modernly fides is concomitant to faith, a more technical translation of the Latin concept would be something like "reliability", in the sense of a trust between two parties for the potentiality of a relationship.
Split into simpler sentences: While modernly fides is concomitant to faith, a more technical translation of the Latin concept would be something like "reliability". The idea of a sense of trust between two parties for the potentiality of a relationship.