Does anyone know how I can use XFSqlTableEditorSaveDataTaskInfo?

As @Celvin Kattookaran mentions, iterate over the rows, checking if a row if an update/insert/delete type. Then build a sql statement to modify the relevant tables on in the database 

For Each row as XFEditedDataRow in args.SqlTableEditorSaveDataTaskInfo
  If row.InsertUpdateOrDelete = DbInsUpdateDelType.Update
     'If a row is updated, add to an "Update" sql command
  ElseIf row.InsertUpdateOrDelete = dbInsUpdateDelType.Insert
     'If a row is an insert, add to an "Insert" sql command
  End if
Next

When returning from the function, make sure to return a XFSqlTableEditorSaveDataTaskResult object, setting the '.CancelDefaultSave' to true:

Dim xfResult As New XFSqlTableEditorSaveDataTaskResult
xfResult.CancelDefaultSave = True
xfResult.IsOK = True
xfResult.ShowMessageBox = False
Return xfResult