The enzymatic action on fats in the duodenum is as follows:

The bile carries out the emulsification of fat.

Then fat is broken down by the enzyme lipase into diglycerides and monoglycerides.

Next intestinal lipases act on these diglycerides and monoglycerides and form fatty acids and glycerol.

The above steps are written in reactions as follows:

Fats Diglycerides → Monoglycerides

Diglycerides and Monoglycerides Fatty acids + Glycerol