Complex sentence: P.J. was the youngest of five children born to Irish Roman Catholic immigrants Patrick Kennedy and Bridget Murphy, who were both from New Ross, County Wexford, and married in Boston on September 26,1849.
Split into simpler sentences: P.J. was the youngest of five children born to Patrick Kennedy, an Irish Roman Catholic immigrant to the United States, and Bridget Murphy. Both of Kennedy's parents were from New Ross, County Wexford, and married in Boston on September 26,1849.