请帮我分析这句话的成分,有几个从句包括其中

Programming languages,in computer science,are the artificial languages used to write a sequence of instructions (a computer program)that can be run by a computer.
主语programming languages,
定语in computer science
谓语are
补语the artificial language
后置定语（ed分词短语作定语）used to write a sequence of instructions(a computer program)
这个定语是表示被动用法,被用来编写程序的.所以用ed分词
原句是定语从句(which is used to write .)实际运用中,which is常被省略
只有一个定语从句that can be run by a computer.先行词是instructions