Complex sentence: In 1856-57 Stone invited evangelist, Charles Finney to preach at Park Street, and proclaimed publicly that Stone had received a spiritual rebirth due to Finney's preaching, causing a stir around Boston and setting off a city-wide revival.
Split into simpler sentences: In 1856-57 Stone invited evangelist, Charles Finney to preach at Park Street. After Finney preached, Stone proclaimed publicly that he had received a spiritual rebirth due to Finney's preaching, causing a stir around Boston and setting off a city-wide revival.