Question

how are the chambers connected to each other and how they are separated

Answer 1

chambers are separated by grooves called septa
auricles seperated by inter auricular septum
ventricles seperated by inter ventricular septum
right auricule, ventricle and left auricle, ventricle seperated by auricule ventricular septum

Answer 2

Human heart has 4 chambers that collectively help in the reoxygenation of blood in the lungs. The deoxygenated blood from the whole body is entered into the right atrium which then pushes it to the right ventricle. From the right ventricle, the deoxygenated blood is taken to the lungs where the oxygenation takes place. The oxygenated blood them taken back to the left atrium which pumped it to the left ventricle from where; aorta takes it to the whole body.  

In order to avoid mixing of oxygenated and deoxygenated blood, there are thick curtain like sheets are present between these chambers called Septum. The septum protects the blood from mixing.