Complex sentence: This was then extended with a further 48km route in 1903 to Tenom, the works for which was completed in 1905, and extend again in 1906 with a further 16km to Melalap.
Split into simpler sentences: This was then extended with a further 48km route in 1903 to Tenom, the works for which was completed in 1905. The line was extended again in 1906 with a further 16km from Tenom to Melalap.