Complex sentence: The King in 1391 referred to Richard as a man on whom he greatly relied for his "circumspection, prudence and fidelity": he spent much of the spring and summer of that year in England in constant attendance on the King.
Split into simpler sentences: The King in 1391 referred to Richard as a man on whom he greatly relied for his "circumspection, prudence and fidelity". He spent much of the spring and summer of that year in England in constant attendance on the King.