This construction is an explanatory complex sentence that is used to enumerate the reasons, purpose, or conditions by using two or more than two coordinate clauses.
Structure : 一来 + reason1 , 二来 + reason2
Example :
她兼职工作，一来多见面朋友，二来可以照顾朋友。
Tā jiānzhí gōngzuò, yī lái duō jiànmiàn péngyǒu, èr lái kěyǐ zhàogù péngyǒu.
She works part-time so that firstly she can meet more friends secondly take care of them.
他当厨师，一来可以挣钱，二来让家人也吃到了美味。
Tā dāng chúshī, yī lái kěyǐ zhèng qián, èr lái ràng jiārén yě chī dàole měiwèi.
As a chef, firstly he can earn money , secondly let his family enjoy delicious food.
你不买这个东西吧。一来太贵, 二来很难看。
Nǐ bú mǎi zhège dōngxī ba. Yī lái tài guì, èr lái hěn nánkàn.
You don't buy this thing. First, it is too expensive, and second, it is unsightly.
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