We kept the sense of the sentence, but we gave more power to the sentence. Communication skills are invaluable in daily life. We have already encountered as the passive verb, a form of to be. The trick becomes to turn are into an active verb. Also, a word, such as invaluable, can be turned into its root, value.
Communication skills increase their value in daily life.
Communication skills provide value in daily life. Daily life needs communication skills. Communication skills create value in daily life. You can see the four attempts to rewrite the sentence present their own problems. You have given the essence of the idea without the passive writing and to be.