Complex sentence: Eventually, the fluid enters the air spaces in the lungs, reduces the amount of oxygen that can enter the blood, and causes shortness of breath (dyspnea), which is the best indicator of estimating central venous pressure is increased.
Split into simpler sentences: Eventually, the fluid enters the air spaces in the lungs, reduces the amount of oxygen that can enter the blood, and causes shortness of breath (dyspnea). JVP, which is the best indicator of estimating central venous pressure is increased.