Later I have to go to the Children's Palace to learn the pia

再晚一些(时候),我就必须去少年宫学习钢琴了.
Later(过会儿) I(我) have to go to(不得不去) the Children's Palace(少年宫) to(介词,无意) learn(学习) the piano(钢琴).
希望能够帮到您~