Complex sentence: It is commonly seen in patients with schizophrenia, and is one of the four main "negative" symptoms of that disorder, the others being flat affect, alogia, anhedonia, and asociality.
Split into simpler sentences: It is commonly seen in patients with schizophrenia, and is one of the four main "negative" symptoms of that disorder. Other characteristics are flat affect, alogia, anhedonia, and asociality.