Complex sentence: The first rail line between Helsinki and Hämeenlinna was opened on January 31,1862, as Finland was then the Grand Duchy of Finland; a region of Imperial Russia, railways were built to the broader Russian track gauge of.
Split into simpler sentences: The first rail line between Helsinki and Hämeenlinna was opened on January 31,1862. As Finland was then the Grand Duchy of Finland; a region of Imperial Russia, railways were built to the broad Russian track gauge of.