Sedges divide quite easily but best done in late winter or early spring, rather than now. The bronze sedges actually self-seed in this area quite frequently so should be relatively easily grown from seed. AFAIK, most grass seeds are planted and germinated in a similar manner:

"GROWING FROM SEEDS

You will be most successful if you sow freshly gathered seeds right away. Here are the steps you can take to grow grasses from seed: Fill a 4 inch or larger nursery pot or other container with a seed starting mix or potting soil that drains well. Scatter seeds thinly onto the surface of the soil. Avoid sowing too thickly as this can result in spindly seedlings or the water- and soil-borne fungal disease damping off. Cover the seeds with a thin layer of fine sand or more seed starting mix. Water well, then cover the container with a clear plastic dome or place it into a clear plastic bag to prevent moisture loss. Shade the container from the sun; however, after germination, remove the cover and place the seedlings in bright light, such as a south-facing window, in a greenhouse, or under fluorescent lights. When plants have two leaves, transplant them into individual pots andcontinue to grow them in a sheltered location until they are well established. As plants grow, continue to transplant them into larger pots until each plant is in a 1 gallon container. Seeds that are sown in fall should be large enough to transplant into the garden the next summer or fall."