Complex sentence: In Buje, the D21 forms at-grade intersections with the D200 linking the Plovanija border crossing with Slovenia and the D300 road connecting to the town of Umag and Umag interchange of the A9 motorway.
Split into simpler sentences: In Buje, the D21 forms at-grade intersections with the D200 and the D300 road. The D200 provides a route to the Plovanija border crossing with Slovenia and the D300 to the town of Umag and Umag interchange of the A9 motorway.