Complex sentence: The three cellular components of the apparatus are the macula densa, extraglomerular mesangial cells, and juxtaglomerular cells (juxtaglomerular cells are not granular cells but are granulated as they release Renin).
Split into simpler sentences: The three cellular components of the apparatus are the macula densa, extraglomerular mesangial cells, and juxtaglomerular cells. They are also known as Juxtaglomerular cells (juxtaglomerular cells are not granular cells but are granulated as they release Renin).