Complex sentence: Reconstruction of Highway 3 to a modern standard with shoulders continued in the 1970s; a segment from Medicine Hat to west of Severn Persons was completed in 1973, with grading for another 21.7 km west of Seven Persons done in 1974.
Split into simpler sentences: Reconstruction of Highway 3 to a modern standard with shoulders continued in the 1970s. A segment from Medicine Hat to west of Severn Persons was completed in 1973, with grading for another 21.7 km west of Seven Persons done in 1974.