20世纪90年代以来年，我国开启了社会养老保险制度改革的翻译：Since in the 1990 of the 20th century and a half years, was the start of social endowment insurance system reform in China 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Since in the 1990 of the 20th century and a half years, was the start of social endowment insurance system reform in China

1990s by the next year, our country have opened the society old-age insurance system reform

Since the beginning of the 1990s, our country, and opened the social pension insurance system reforms

Since in the 1990 of the 20th century and a half years, was the start of social endowment insurance system reform in China