历经两年才完善的新型网络电话系统的翻译：After two years to improve the new VoIP system 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

After two years complete new network telephone system

After two years to improve the new VoIP system

Has been through repeatedly two year only then perfect new network telephone system

After two years to perfect the new phone system

After two years to improve the new VoIP system