Complex sentence: Phagocytosis is a specific form of endocytosis involving the vascular internalization of solids such as bacteria by an organism, and is therefore distinct from other forms of endocytosis such as the vesicular internalization of various liquids (pinocytosis).
Split into simpler sentences: Phagocytosis is a specific form of endocytosis involving the internalization of solids, such as bacteria, by a cell. It is distinct from other forms of endocytosis such as the internalization of various liquids that utilizes the process of (pinocytosis).