Complex sentence: Matthew was exiled again from 1619 to 1622, and upon his return, he was favorably received by the king, and acted as an agent at court to promote the marriage of Charles, Prince of Wales with the Spanish Infanta, Maria Anna of Spain.
Split into simpler sentences: Matthew was exiled again from 1619 to 1622, but was favorably received by the king upon his return. He acted as an agent at court to promote the marriage of Charles, Prince of Wales with the Spanish Infanta, Maria Anna of Spain.