Formally , his post at Ibadan lasted for three years , but in the second year he was substituted by John Kelly while Laver returned to Edinburgh in exchange .
ADV , PRON NOUN ADP PROPN VERB ADP NUM NOUN , CCONJ ADP DET ADJ NOUN PRON AUX VERB ADP PROPN PROPN SCONJ PROPN VERB ADP PROPN ADP NOUN .