시제가 이상합니다.

an indian tribe had sent two of their men to meet some people who are transporting a piano for them.the indians had built their village on the base of a mountain so it tooka quitelong time to transport the piano.
어찌하여 뜬금없는 had sent 인지....게다가 도대체 왜 are transporting 인지....아흐