Complex sentence: Laing saw an uncorrupted natural state for the human mind, and tended to condemn society for causing mental illness, and recommend going more deeply into the illness as a way of working through it, back to normality.
Split into simpler sentences: Laing saw an uncorrupted natural state for the human mind, and tended to condemn society for causing mental illness. He saw mental illness as a possible healing process, a way of working through things, back to normality.