Complex sentence: He traced his lineage to a certain marquis whose family name was "Kou" (寇), and was also related to the House of Liu (the imperial clan of the Han dynasty, from which Liu Bei descended), albeit not directly.
Split into simpler sentences: He traced his lineage to a certain marquis whose family name was "Kou" (寇). He was also related to the House of Liu--the imperial clan of the Han dynasty from which Liu Bei descended--albeit not directly.