英语语法问题From the Skeppsbron and surrounding islands the people

英语语法问题
From the Skeppsbron and surrounding islands the people watched this thing of beauty begin to spread her sails and catch the wind.
这个句话书上说的是begin to spread her sails and catch the wind 是宾补,但是我感觉this thing of beauty begin to spread her sails and catch the wind做的是watched宾语,哪种说法对,如果this thing .the wind 想改成watched 的宾语怎么改