6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep.

Read 1 Corinthians 15:6 Using Other Translations

After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep.
Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep.
After that, he was seen by more than 500 of his followers at one time, most of whom are still alive, though some have died.