英语句子结构、成分分析To retrieve information about the database, you u

【To retrieve information about the database目的状语】,you use a report（主谓宾结构）.A report（主）is（系）a procedure（表）【that extracts（从句第一个谓语）information in the database,formats（从句第二个谓语）the information with text,and sends（从句第三个谓语）it to an output device (usually in the printer)定语从句】.
分析如上,一共两个句子,第一个句子是个简单句,前面是不定式构成的目的状语.第二个句子是复合句,主句为A report is a procedure,简单的主系表结构,其中a procedure是后面定语从句的先行词,【that extracts information in the database,formats the information with text,and sends it to an output device (usually in the printer).】这是定语从句,其中有三个并列的动宾结构作为谓语.

To retrieve information about the database作目的状语you use a report是主句。A report is a procedure 是另一个主句that extracts information in the database,formats the information with text, and ...

这段话共有两个句子。
句子1：To retrieve information about the database，, you use a report.
该句是简单句。其中： To retrieve information about the database做目的状语；, you use a report. 的结构是：主语(you)-谓语(...