For he longed after you all, and was full of heaviness, because that ye had heard that he had been sick.
For he has been [homesick] longing for you all and has been distressed because you had heard that he was ill.
since he longed after you all, and was sore troubled, because ye had heard that he was sick:
He misses you all, and he was upset because you heard he was sick.
For certainly, he has desired all of you, and he was saddened because you had heard that he was sick.