original: In 1975 these two districts were merged to form today's district.
simplifications: In 1975 these two districts were came together to form today's district. In 1975 the two districts were united to form today's district. The two districts merged in 1975. Today they are one district. In 1975, these two districts were united to form today's district. In 1975 these two districts were put together to form the current district. Both districts joined together in 1975 which formed the one district that is still running today. These two districts were combined to make today's district. In 1975 the two districts merged to form today's district. These two districts were merged together in 1975. These two districts came together in 1975 to form today's district.