so that = para que
We walked really fast so that we could reach the last train back to London.
Caminamos muy rápido para que pudiéramos alcanzar el último tren de regreso a Londres.
He had very thick spectacles so that he looked like an insect.
Llevaba unas gafas muy gruesas para que pareciera un insecto.
She looked really beautiful so that he couldn't keep his eyes from her.
Se veía muy hermosa, para que no lograra desprender sus ojos de ella.