Complex sentence: Two years later he appeared before a committee of inquiry into silicosis as an expert witness on behalf of the pottery workers; this became a passionate cause and successive government schemes providing compensation for people suffering from pneumoconiosis and silicosis were established as a result of his campaigning.
Split into simpler sentences: Two years later he appeared before a committee of inquiry into silicosis as an expert witness on behalf of the pottery workers. His campaign on silicosis became a passionate cause and successive government schemes providing compensation for people suffering from pneumoconiosis and silicosis were established as a result of his campaigning.