Complex sentence: SCL show intense immune infiltration which is predominantly neutrophillic, however the tumors evade the immune system by increased expression of a negative regulator of T-cells mainly programmed death ligand-1.
Split into simpler sentences: SCL show intense immune infiltration which is predominantly neutrophillic. However the tumors evade the immune system by increased expression of a negative regulator of T-cells mainly programmed death ligand-1.