Complex sentence: Microalbuminuria occurs when the kidney leaks small amounts of albumin into the urine, in other words, when there is an abnormally high permeability for albumin in the renal glomerulus.
Split into simpler sentences: Microalbuminuria occurs when the kidney leaks small amounts of albumin into the urine. In other words, when there is an abnormally high permeability for albumin in the renal glomerulus.