Complex sentence: It is one of a family of selectins that includes E-selectin (endothelial) and L-selectin (leukocyte), and selectins are part of the broader family of cell adhesion molecules.
Split into simpler sentences: It is one of a family of selectins that includes E-selectin (endothelial) and L-selectin (leukocyte). Selectins are part of the broader family of cell adhesion molecules.