Complex sentence: Although the sessions do not appear to be very fruitful, it is the first time they mutually acknowledge that there is a problem in their relationship.just recognizing that there is a problem is a great first step.
Split into simpler sentences: Although the sessions do not appear to be very fruitful, it is the first time they mutually acknowledge that there is a problem in their relationship. Just recognizing that there is a problem is a great first step.