The phrase is a reminder of its medieval provenance, its academic focus, and its corporate style.
( ( The phrase ) ( ( is ( ( a reminder ) ( of ( ( ( ( ( ( its ( medieval provenance ) ) , ) ( its ( academic focus ) ) ) , ) and ) ( its ( corporate style ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN phrase)) (VP (VBZ is) (NP (NP (DT a) (NN reminder)) (PP (IN of) (NP (NP (PRP$ its) (JJ medieval) (NN provenance)) (, ,) (NP (PRP$ its) (JJ academic) (NN focus)) (, ,) (CC and) (NP (PRP$ its) (JJ corporate) (NN style)))))) (. .)))
its medieval origin is a constant reminder of the phrase. 
( ( its ( medieval origin ) ) ( ( is ( ( a ( constant reminder ) ) ( of ( the phrase ) ) ) ) . ) )
(ROOT (S (NP (PRP$ its) (JJ medieval) (NN origin)) (VP (VBZ is) (NP (NP (DT a) (JJ constant) (NN reminder)) (PP (IN of) (NP (DT the) (NN phrase))))) (. .)))