Complex sentence: Although Saleh had told his people about God's mercy, they argued and demanded that he obtain a miracle, which showed a weakness on the part of Thamud people, a childish reliance on visual miracles rather than spiritual faith.
Split into simpler sentences: Although Saleh had told his people about God's mercy, they argued and demanded that he obtain a miracle. This showed a weakness on the part of Thamud people, and represents in them a childish reliance on visual miracles rather than spiritual faith.