英语翻译Since the first acid-gas injection operation in 1990,51d

英语翻译
Since the first acid-gas injection operation in 1990,51
different injection sites have been approved,of which 44 are
currently active.One operation was not implemented,three were
rescinded after a period of operation (either because injection
volumes reached the approved limit or because the gas plant
producing the acid gas was decommissioned) and three sites
were suspended by the regulatory agency because of reservoir
overpressuring.
大致意思准确,通顺的,