Complex sentence: It was here that the first British coaldust experiments took place during 1908 and 1909, conducted by W. E. Garforth, manager of the colliery and president of the Mining Association of Great Britain.
Split into simpler sentences: It was here that the first British coaldust experiments took place during 1908 and 1909. They were conducted by W. E. Garforth, manager of the colliery and president of the Mining Association of Great Britain.