Connecting information from different garmin devices ?

So there is no way To connect available data In any way?

No. 

Well, there are 3rd party services that be used to join data, but it means you must extract all data to files, join, delete original activities and then upload data. Lots of work. You must also manage to export HR data and that data will be very inaccurate compared to HR from broadcast or strap. 

What a shame, as data is allready there :/

The data you see is a lot less accurate and it would not be useful in an activity. Most highs and lows are missing. That data is more usable for non activities like sleep, work, being at home etc with mostly low and stable HR.