Complex sentence: Blood gas analysis of arterial blood is primarily used to monitor carbon dioxide and oxygen levels related to pulmonary function, but it is also used to measure blood pH and bicarbonate levels for certain metabolic conditions.
Split into simpler sentences: Blood gas analysis of arterial blood is primarily used to monitor carbon dioxide and oxygen levels related to pulmonary function. But, it is also used to measure blood pH and bicarbonate levels for certain metabolic conditions.