Complex sentence: In addition the northern part of the station building has been developed into a model railway exhibition, which is open to the public most days, and some static exhibits of railway memorabilia have been placed on the platform beyond the model exhibition.
Split into simpler sentences: In addition the northern part of the station building has been developed into a model railway exhibition, which is open to the public most days. Additionally, some static exhibits of railway memorobilia have been placed on the platform beyond the model exhibition.