Complex sentence: In 1943, J Hill's directors were finding it increasingly difficult to operate within the government's restrictive pricing control policy, so decided to form a company that sold processed fish, which was not liable to price control.
Split into simpler sentences: In 1943, J Hill's directors found it increasingly difficult to operate within the government's restrictive pricing control policy. As a result, they decided to form a company that sold processed fish, which was not liable to price control.