Complex sentence: In 2011 the organisation was criticised for euthanasing cats with chloroform, although it is done legally and is considered to be necessary to address the problem of stray cats, seen as a large problem in the city.
Split into simpler sentences: In 2011 the organisation was criticised for euthanasing cats with chloroform. It is done legally and is considered to be necessary to address the problem of stray cats, seen as a large problem in the city.