Complex sentence: He first met Sara C. Charles, a Maryknoll nun and psychiatrist, in mid 1960s, while he was hospitalized in New York owing to a pericardial infection, after over a decade of friendship they married in September 1977 and authored several books together.
Split into simpler sentences: He first met Sara C. Charles, a Maryknoll nun and psychiatrist, in mid 1960s, while he was hospitalized in New York owing to a pericardial infection. After over a decade of friendship they married in September 1977 and authored several books together.