Other black creatures you control get +1/+1.
Other green creatures you control get +1/+1.
At the beginning of your upkeep, you may create a 1/1 black and green Worm creature token.
Since the token is black and green, it will get +2/+2 from Creakwood Liege as long as the Liege is on the battlefield.
The abilities are separate and cumulative. If another creature you control is both of the listed colors, it will get a total of +2/+2.