지각동사 수동태와 과거완료진행형 질문드려요

“He was seen entering the building about the time the crime was committed.”에서 지각동사 수동태는 to enter로 바꾸는 것 아닌가요? 문장 해석도 궁금해요.
“Jonny, who had been working for the NGO for more than three decades, believed that fighting for animal rights was something as important as fighting for human rights.”에서 had been도 맞는 표현인지 궁금합니다.