Hi Diego,
Thank you for your interest in Syncfusion products.
The Sample program you find makes use of OldTable concept in PDF where column spanning is not supported. Column spanning is supported in "NewTable Model". Our Newtable model has many new features like column overflow,autofit,cell merge,column repeat,exact table position when the table spans multiple pages,etc... Please take a look at the following new table model sample which demonstrates the various features.
http://www.syncfusion.com/Support/user/uploads/TableFeatures_f466034a.zipHere is the sample where the column text spans for more than a page.
rel='nofollow' href="http://www.syncfusion.com/Support/user/uploads/Column_MoreNewTable_64e16a7cRegards,
Sarath