Complex sentence: The regiment had been following the tradition of the Grand Duchy of Lithuania formed in 1792 and stationed in Janow, the same place where over century later, the 13th regiment fought its very first battle.
Split into simpler sentences: The regiment had been following the tradition of the Grand Duchy of Lithuania formed in 1792 and stationed in Janow. The very same Janow where over century later, the 13th regiment fought its very first battle.