Add punctuation: Every 15 minutes we heard the steamclock and saw tourists gather around it
A: Every 15 minutes we heard the steamclock and saw tourists gather around it.

Add punctuation: If the entire ceiling or parts of it are particularly subjected to soiling it is important to get it regularly cleaned
A: If the entire ceiling or parts of it are particularly subjected to soiling, it is important to get it regularly cleaned.

Add punctuation: The Netherlands November date to be confirmed
A:
The Netherlands: November (date to be confirmed)