Complex sentence: In the peripheral tissues Listeria can invade leukocytes such as monocytes and dendritic cells from infected endothelial cells via the paracytophagous mode of invasion.
Split into simpler sentences: In the peripheral tissues, Listeria can invade leukocytes such as monocytes and dendritic cells. The bacteria can do this from infected endothelial cells via the paracytophagous mode of invasion.