Original sentence: In May 2007, Billerica was the subject of legal action and forced to pay a $250,000 penalty for discharging pollutants into the Concord River.Industrial wastes were dumped  into the river, along with untreated sewage and other organic waste.Perchlorate was detected in the Concord River in August 2004.Pollutants such as heavy metals and PCBs remain trapped in the sediment.The Concord River empties into the Merrimack River.The early 1960s saw an increase chemical and metal firms in support of the electronics industry within the Boston metropolitan area.Throughout much of the Sudbury River and downstream into the Concord River, fish consumption is banned due to mercury-laden sediments from the Nyanza Superfund site and other sources
Edited sentence: Factories located along the Concord River contributed to this situation because the river flows directly into the Merrimack.However, in the early 1960s, manufacturing was again on the rise, along with chemical and metal firms in support of the electronics industry within the Boston metropolitan area.In May 2007, Billerica was again in the news when the town itself was the subject of legal action.Massive amounts of waste were dumped directly into the river, which was already heavily laden with untreated sewage and other organic waste.Perchlorate was also detected in the Concord River in August 2004.The town was forced to pay a $250,000 penalty for discharging pollutants into the Concord River.Throughout much of the Sudbury River downstream into the Concord River, fish consumption is banned due to mercury-laden sediments from the Nyanza Superfund site and other sources.Unfortunately, many pollutants, such as heavy metals and PCBs, remain trapped in the sediment