Original sentence: The Aerotoxic Associaton was set up on 18th June 2007 at the British Houses of Parliament by a group of airline pilots who believe they were made ill by the cabin air on jet aircraft, with the assumption that the cabin air was contaminated with engine oil.The aims of the association are to inform aircrew and passengers about the dangers of contaminated air, provide help and support and to lobby for change in regulations to improve the air quality on airliners
Edited sentence: The Aerotoxic Associaton was set up on 18th June 2007 at the British Houses of Parliament by a group of airline pilots who believe they were made ill by the cabin air on jet aircraft, which can get contaminated by oil from the engines.The aims of the association are to inform aircrew and passengers about the dangers of this contaminated air, provide help and support and to lobby for change in regulations to improve the air quality on airliners