Original: The Gunnedah Colliery Company was registered in May 1899 and by 22 June a private railway some 5.7 k in length had been completed from the railway station to their mine.
Simplified: The Gunnedah Colliery Company was registered in May, 1899. One month later a private railway some 5.7 km in length had been completed from the railway station to their mine.