Complex sentence: She and her spouse received Sofiero Palace as a wedding gift, and they spent their summers there and made a great effort creating gardens in an English style on the estate; her children participated in their improvement.
Split into simpler sentences: She and her spouse received Sofiero Palace as a wedding gift, and they spent their summers there and made a great effort in the gardens of the estate. The gardens of Sofiero were in an English style, and her children participated in their improvement.