Complex sentence: Unlike their neighbouring cells, M cells have the unique ability to take up antigen from the lumen of the small intestine via endocytosis or phagocytosis, and then deliver it via transcytosis to antigen presenting cells, such as dendritic cells and lymphocytes (namely T cells).
Split into simpler sentences: Unlike their neighbouring cells, M cells have the unique ability to take up antigen from the lumen of the small intestine via endocytosis, phagocytosis, or transcytosis. Antigens are delivered to antigen presenting cells, such as dendritic cells and lymphocytes (namely T cells).