Complex sentence: The two substances in combination proved very popular and were also smoked in normal "dry" pipes, but the water pipe remained the most common smoking tool until the introduction of the cigarette in the 20th century.
Split into simpler sentences: The two substances in combination became very popular and were also smoked in normal "dry" pipes. The water pipe, however, remained the most common smoking tool until the introduction of the cigarette in the 20th century.