As for printing, please look at the print demo which comes with TAChart. It defines a rectangle on the paper into which the chart will be printed. In the same way you defne a second rectangle for the second chart, and you just duplicated the code used for the first chart.
As for saving as a combined jpeg, you should use the function Chart.SaveToImage(format) where format is the class of the image to be created, e.g. TBitmap. This way you can save each chart into a separate bitmap, and later you can combine them by drawing them on the canvas of the final jpeg.
See attachment.