Complex sentence: Legh was returned to Parliament for Cheshire North in 1841, a seat he held until 1847 and again between 1848 and 1868, when it was abolished and he was instead returned for the newly-created Mid Cheshire constituency, which he represented until 1873.
Split into simpler sentences: Legh was returned to Parliament for Cheshire North in 1841, a seat he held until 1847 and again between 1848 and 1868. The latter year the constituency was abolished and he was instead elected for the newly created Cheshire Mid constituency, which he represented until 1873.