Complex sentence: On October 15, Yeo put out in the three-decked ship of the line "Saint Lawrence", dominating the Lake until November 21, when winter set in.
Split into simpler sentences: On October 15, Yeo put out in the three-decked ship of the line "Saint Lawrence". Malcolmson, pp.307-308 Yeo dominated the Lake until November 21, when winter set in.