Complex sentence: Early in the opening of the Kaleva Bottle House Museum, the children coming through it often just wanted to see the bathroom, as the bathtub had been featured in a Nickelodeon show with a sock puppet.
Split into simpler sentences: Early in the opening of the Kaleva Bottle House Museum many times the children coming through it wanted to see just the bathroom. It seems that the bathtub had been featured in a Nickelodeon show with a sock puppet.