Complex sentence: After restoration, G42 became the regular engine on Puffing Billy's "The Luncheon Train" which operates 7 days a week as far as Lakeside, as well as operating special trains on a semi-regular basis until 2009.
Split into simpler sentences: After restoration, G42 became the regular engine on Puffing Billy's "The Luncheon Train" which operates 7 days a week as far as Lakeside. As well as operating special trains on a semi-regular basis until 2009.