Complex sentence: In 1992 construction of the Hallandsås tunnel in Sweden began, with opening plans for 1995, groundwater leaking into the tunnel was however a major problem, slowing the progress, and Rhoca-Gil had to be used.
Split into simpler sentences: In 1992 construction of the Hallandsås tunnel in Sweden began, with opening plans for 1995. Groundwater leaking into the tunnel was however a major problem, slowing the progress, and Rhoca-Gil had to be used.