Hi Brian,
Thank you for your interest in Syncfusion products.
If the page breaks are specified in the HTML, then it can be applied in the converted PDF document by turning on the following property:
HtmlConverter.AutoDetectPageBreak = true;
By default, this property is set to false which makes the PDF to break only for the PdfPage size. Turning on this property will ensure page breaks in HTML along with PdfPage breaks.
Please try this and let me know if you have any questions.
Regards
Geetha