How to say “He read for hours, leaning against a pile of pillows.” in Japanese

In Japanese

あの子(こ)、積(つ)み上(あ)げた枕(まくら)にもたれて、何時間(なんじかん)も本(ほん)を読(よ)んでたよ。

Ano ko, tsumiageta makura ni motarete, nanjikan mo hon o yondeta yo.