Complex sentence: Pleural fluid is a serous fluid produced by the plIn normal pleurae, most fluid is produced by the parietal circulation (intercostal arteries) via bulk flow and reabsorbed by the lymphatic system.
Split into simpler sentences: Pleural fluid is a serous fluid produced by the normal pleurae. Most fluid is produced by the parietal circulation (intercostal arteries) via bulk flow and reabsorbed by the lymphatic system.