Original: Despite his paternal grandparents' conversion to Protestantism, the Wittgenstein children were baptized as Roman Catholics—the faith of their maternal grandmother—and Ludwig was given a Roman Catholic burial upon his death.
Simplified: Despite Karl's Protestantism, and the fact that Leopoldine's father was Jewish, the Wittgenstein children were baptized as Roman Catholics — the faith of their maternal grandmother — and Ludwig was given a Roman Catholic burial upon his death.