Bonjour
<em>The museum houses many medieval artifacts. It has many tapestries.</em>
[<em>Le musée </em>] [ qui abrite beaucoup d'artefacts <em>(objets) </em>médiévaux,] [ <em>a beaucoup de tapisseries</em>.]
<em>the museum that houses many medieval artefacts, has many tapestries.</em>
<em />
OR
[Le musée ] [qui a beaucoup de tapisseries,] [ abrite beaucoup d'artefacts <em>(objets) </em>médiévaux.]
<em>The museum that has many tapestries, houses many medieval artefacts.</em>
<em />
<em>OR</em>
<em />
[Le musée abrite beaucoup d'artefacts <em>(objets)</em> médiévaux ] [ qui sont des tapisseries.]
<em>Ithe museum houses many medieval artifacts which are tapestries.</em>
OR
Le musée abrite beaucoup d'artefacts <em>(objets) </em>médiévaux dont des tapisseries.
<em>the museum houses many medieval artfacts "including" tapestries.</em>
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hope one of them will be one you're waiting for.
They are all correct in French ☺☺☺