finding a subject造句

In the same letter he tells of working towards finding a subject with the Italian 閙igr? Count Pepoli, who had not written a libretto before.
In finding a subject matter for the song, he explains that he came across a report on the post-Olympic Games in Beijing and what happened to people who were exploited there, and also saw something on the kidnappings of children in China.
In the same letter he continues by stating that he was working towards finding a subject with the Italian emigr? Count Pepoli, who came from a prominent Bologna family and who had been active in opposition to Austrian rule of Italy, until forced into exile in France and England.
It's difficult to find finding a subject in a sentence. 用finding a subject造句挺难的