Complex sentence: This became a meeting place for French and European intelligentsia until the 1930s when due to the wall street crash Kahn became bankrupt, the garden was turned into a public park in which Kahn would still take walks.
Split into simpler sentences: This became a meeting place for French and European intelligentsia until the 1930s when due to the wall street crash Kahn became bankrupt. At that time the garden was turned into a public park in which Kahn would still take walks.