Please see the link below.

You can turn it this way and that..

Just an alternative suggestion.

At the xyz fair in Wels, visitors will learn about sustainable construction methods for a healthy built environment (for future generations)

1) It’s not just homes but also office and factory buildings
2) You need to separate out the two adjectives/adverbs here. They are using sustainable methods for a healthy outcome. (The methods may well be ‘healthy’ too, i.e. safe working practices, but that’s not the issue here.)
3) ‘For future generations’ is already contained in the concept of sustainability and is therefore redundant.
4) erleben = discover, learn about, but not experience


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Note added at 4 hrs (2020-07-07 11:38:38 GMT)
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PS
A 'sustainable building' is one that can be 'sustained'. (whatever that may mean).
'Sustainable building methods' is a different concept and refers to the responsible use of scarce resources and a move to renewables.

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Note added at 5 hrs (2020-07-07 11:48:29 GMT)
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I think I have found your trade fair. If it is indeed about energy conservation, then I would propose this as an alternative:
how the industry is constructing a healthy and energy-efficient built environment for many generations to come
I think nachhaltig/sustainable is starting to grate on listeners/readers.


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Note added at 7 hrs (2020-07-07 14:25:01 GMT)
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Phil suggests the following abbreviated phrasing:
At the xyz fair in Wels, visitors will discover how the industry is creating a healthy and energy-efficient built environment for generations to come