Complex sentence: The 1949 Act was amended in 1958 and 1979 and replaced by the 1986 Act; changes in legislation from 1944 to 1986 were generally incremental in nature.
Split into simpler sentences: The 1949 Act was amended in 1958 and 1979 and replaced by the 1986 Act. The changes in legislation from 1944 to 1986 were generally incremental in nature.