Complex sentence: NKB usually found in the brain, has been found in the placenta at a concentration of 2.6 times that of the NKB in the brain, possibly leading to the onset of pre-eclampsia in mothers.
Split into simpler sentences: NKB usually found in the brain, has been found in the placenta at a concentration of 2.6 times that of the NKB in the brain. Possibly leading to the onset of pre-eclampsia in mothers.