Complex sentence: The mayor of Boston at the time, John Hynes, decided to put William Schofield's idea into action, and by 1953,40,000 people were enjoying the sites and history on the Freedom Trail.
Split into simpler sentences: The mayor of Boston at the time, John Hynes, decided to put William Schofield's idea into action. By 1953,40,000 people were enjoying the sites and history on the Freedom Trail.