Complex sentence: The property was improved again in 1840 by the construction of an iron fence on Tremont Street designed by Boston architect Isaiah Rogers at a cost of $5,000, half paid by the city and half by public subscription.
Split into simpler sentences: The property was improved again in 1840 by the construction of an iron fence on Tremont Street. The fence was designed by Boston architect Isaiah Rogers at a cost of $5,000, half paid by the city and half by public subscription.