Tā hěn nǔlì, fǎnguòláishuō, tā yě hěn róngyì píbèi.
He works very hard; conversely, he also tires easily.
Tips
grammar
反过来说 is a discourse connector used to introduce a contrasting or opposite perspective. It is similar to 另一方面 (on the other hand) but specifically signals a logical reversal or counterpoint to what was just stated.
