Wiring Help Replacing a Two Switch Ceiling Fan and Light with Only a Single Light Fixture--See Photos
Lets eliminate the switch with the red wire. Remove the two black wires on the red wire switch, one from the screw terminal and one from the backstab and wire nut them together. Remove the red wire and put a wire nut on it.
Now get a new single pole single throw, standard toggle switch since you stated both switches were cracked. Remove the black wire loop from the switch screw terminal and the wire from the backstab next to it. Pigtail them with a small piece of black wire and connect it to the new switch. Remove the other black wire from the backstab at the other end of the switch and bend a shepherd's hook on the stripped wire and screw it to the other terminal on the new switch. Ground the switch with a piece of #14 wire. Now mount the switch and get a cover similar to the one shown below.
To remove the backstab wires, shove a small screwdriver into the slot by the wires and put the wire out.

At the ceiling box, remove the red wire and wire nut it. Connect the black wire from the box to the black wire from the light fixture with a wire nut. connect the white wires together the same way. Connect the two ground wires together with a wire nut.