这句英语句子的结构是怎样的.这句英语句子的结构是怎样的?And that was that for another twenty odd years,when by chance i came across an article in a newspaper on research into synesthesia at London hospital

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系表结构when by chance i came across an article in a newspaper on research into synesthesia at London hospital时间状语

And that（主语） was（系动词） that for another twenty odd years（that引导的表语从句充当表语）,when by chance（时间状语,修饰后面的整个句子） i（主语） came across(谓语) an article（宾语） in a newspaper on research into synesthesia at London hospital（宾补）