Complex sentence: Physical pain, inability to find occupation in life and feeling of being a burden to people put him on the verge of a suicide, however, he managed not only to recover his mental balance but also to start helping others with their psychological problems.
Split into simpler sentences: Physical pain, an inability to find employment, and the sense of being a burden to people put him on the verge of suicide. He manages not only to recover his mental balance but also begins to help others cope with their psychological problems.