Complex sentence: The flowers shown floating on the river were chosen to correspond with Shakespeare's description of Ophelia's garland, however they also reflect the Victorian interest in the "language of flowers", according to which each flower carries a symbolic meaning.
Split into simpler sentences: The flowers shown floating on the river were chosen to correspond with Shakespeare's description of Ophelia's garland. They also reflect the Victorian interest in the "language of flowers", according to which each flower carries a symbolic meaning.