Complex sentence: The interleukin-8 receptors (IL-8R) are two 7-transmembrane proteins in the G-protein coupled-receptor family: interleukin-8 receptor A (IL-8RA) and interleukin-8 receptor B (IL-8RB).
Split into simpler sentences: The interleukin-8 receptors (IL-8R) are two 7-transmembrane proteins in the G-protein coupled-receptor family. There are two receptors with this name: interleukin-8 receptor A (IL-8RA) and interleukin-8 receptor B (IL-8RB).