understandable (to the general public in terms of comprehension or suitability) adj.: exoteric

[Robert Penn Warren] saw nothing contradictory in his esoteric and exoteric activities, and wrote with equal facility for magazines such as Life and for those of small circulation. (Daniel Aaron, A Minor Master, The New Republic, 10/20/1997.)

This word, when used in the above sense can also be a synonym for accessible or comprehensible.