The factory released a huge amount of waste into the river. This contaminated the water and killed a lot of fish.

The factory released a huge amount of waste into the river, which contaminated the water and killed a lot of fish.

The factory can release a huge amount of waste into the river and cause water contamination.

The water is contaminated because of the huge amount of waste released into the river by the factory.

The factory released a huge amount of waste into the river that can contaminate the water and kill a lot of fish.