Complex sentence: MacColl had written numerous poems, mainly of a lyrical character, during his residence in Canada, one of the most noted of which is his "Robin", written for the occasion of the Burns Centennial celebration in Kingston.
Split into simpler sentences: MacColl had written numerous poems, mainly of a lyrical character, while in Canada. One of the most noted is his "Robin", written for the occasion of the Burns Centennial celebration in Kingston.