More than likely (typical of swords but not guaranteed), it will produce some plantlets along the stem, which can be removed and planted when the roots are long enough. If it does produce seeds, and you may have to fertilize the flower using a fine paintbrush or similar, they can be planted when they mature. It is usually better to plant them in a shallow container with the seed just covered with water, after they germinate, you can continue to add water as they grow. Conversely you can grow them emersed if you can maintain a high enough humidity above the plant. Then, it can be acclimated to submerged growth. As an example, all Tropica plants are grown emmersed, in high humidity greenhouses, and they sometimes are difficult to revert to submerged growth.
Good luck with it. It's always nice to see a plant prosper and bloom.