Word definitions
mukombe: hollowed out gourd with a long handle used for drinking
gengezha: reference to an old/ cracked mukombe
demhe: piece of broken gourd
Translation
An old drinking gourd is better than just a piece of a broken gourd.
Inspiration for proverb
An old or cracked drinking gourd can still serve the purpose of a drinking utensil. It is better than just a piece of broken gourd.
Application
To have something even if less than what is desired, is better than having nothing at all.