Complex sentence: Watkin, 1996, page 71 Soane did not deliver his first lecture until 27 March 1809 and did not begin to deliver the full series of twelve lectures until, January 1810.
Split into simpler sentences: Watkin, 1996, page 71 Although Soane did not deliver his first lecture until 27 March 1809. Although he did not begin to deliver the full series of twelve lectures until, January 1810.