Complex sentence: Two east-west lines linking the coast and the hinterland were built under colonial rule as German East Africa: the Central Line runs from Dar es Salaam to Kigoma, and the Tanga Line from Tanga to Arusha.
Split into simpler sentences: Two east-west lines linking the coast and the hinterland were built when the country was under colonial rule as German East Africa. The Central Line runs from Dar es Salaam to Kigoma, and the Tanga Line from Tanga to Arusha.