Complex sentence: Given the enmity between them, O'Flanagan "Lives of the Chancellors" regarded Alen's magnanimous conduct towards St. Leger on one crucial occasion as praiseworthy: when Archbishop Browne charged St. Leger with treasonable words, he gave Alen as his source.
Split into simpler sentences: Given the enmity between them, O'Flanagan "Lives of the Chancellors" regarded Alen's magnanimous conduct towards St. Leger on one crucial occasion as praiseworthy. When Archbishop Browne charged St. Leger with treasonable words, he gave Alen as his source.