Complex sentence: On Ellis's death the estate passed to his son Jacob Fletcher Fletcher who died in 1857 and the collieries were then managed by trustees until his daughter Charlotte Anne Fletcher (who was 12 years old when her father died) was old enough to inherit the business.
Split into simpler sentences: On Ellis's death the estate passed to his son Jacob Fletcher Fletcher. Following the death of Jacob Fletcher Fletcher in 1857, the collieries were managed by trustees until his daughter Charlotte Anne Fletcher (who was only 12 years old when her father died) was old enough to inherit the business.