lì / shǐ / kè / shàng / wǒ / men / xué / xí / le / dōng / Luó / mǎ / Dì / guó / de / fā / zhǎn / hé / shuāi / luò

历史课上，我们学习了东罗马帝国的发展和衰落。

In history class, we studied the rise and decline of the Eastern Roman Empire.