In the past 100 years, there is probably no people who have endured as much hardship as the Jewish people.
Literal
This 100-years, Jewish-people [as much as-ほど] hardship [object-を] tasted-come people [topic-は] not-exist [probably-だろう].
苦難をなめる 'to taste hardship' — なめる used figuratively for enduring suffering. ~てきた 'have been doing (up to now)' marks cumulative experience over time. ~ほど…ない 'there is nothing as much as' is a superlative comparison pattern.