Complex sentence: Because Paul speaks of Onesiphorus only in the past tense, wishes present blessings upon his house (family), and mercy for him "in that day", some scholars believe that Onesiphorus had at this point died.
Split into simpler sentences: Because Paul speaks of Onesiphorus only in the past tense, wishes present blessings upon his house (family), and mercy for him "in that day". Some scholars believe that Onesiphorus had at this point died.