Complex sentence: At the completion of the record flights, both S.6Bs were retired, with the Schneider Trophy winning S.6B "S1595" donated to the Science Museum in London, where it currently resides in an unrestored state.
Split into simpler sentences: At the completion of the record flights, both S.6Bs were retired. The Schneider Trophy winning S.6B "S1595" was donated to the Science Museum in London, where it resides in an unrestored state.