Enables phosphatidylglycerol phospholipase C activity. Involved in phosphatidylglycerol catabolic process. Located in lipid droplet and mitochondrion. Orthologous to human GDPD1 (glycerophosphodiester phosphodiesterase domain containing 1) and GDPD3 (glycerophosphodiester phosphodiesterase domain containing 3).