Complex sentence: Diffuse infiltrative lymphocytosis syndrome occurs in HIV positive patients with low CD4 counts and is similar to Sjögren's syndrome, with painless parotid and submandibular swelling, and sicca symptoms.
Split into simpler sentences: Diffuse infiltrative lymphocytosis syndrome occurs in HIV positive patients with low CD4 counts. It is similar to Sjögren's syndrome, with painless parotid and submandibular swelling, and sicca symptoms.