Complex sentence: On 1 July 1913 the line was absorbed by Cambrian Railways and subsequently grouped into the Great Western Railway (GWR) network in 1923 and incorporated into the nationalised network in 1948.
Split into simpler sentences: On 1 July 1913, the line was absorbed by Cambrian Railways. It was subsequently grouped into the Great Western Railway (GWR) network in 1923 and incorporated into the nationalised network in 1948.