Structure

Just add 再说 to the beginning of the second clause of your sentence. Remember that both statements should be related to each other!
Clause 1 , 再说 + Clause 2

Examples

Wǒháibùxiǎnɡjiéhūn, yīnwèiniánjìtàixiǎole. Zàishuō, yěméiyǒuyùdàohéshìderén.
我还不想结婚,因为年纪太小了。再说 ,也没有遇到合适的人。
I haven't got a plan on getting married yet.I‘m still young and besides,I haven't met the right one.

Xiànzài tài zǎo le, wǒ bú xiǎnɡ qù, zàishuō nà ɡè shānɡdiàn hái méi kāimén.
现在 太 早 了,我 不 想 去,再说 那 个 商店 还 没 开门。
It's too early now.I don't want to go. The store hasn't opened yet, anyway.

Wǒ bùxiǎnɡ bānɡzhù tā, yīnwèi tā jīnɡchánɡ shuōhuǎnɡ, zàishuō wǒ yě méi qián。
我 不想 帮助 他,因为 他 经常 说谎,再说 我 也 没 钱。
I don't want to help him. He lies a lot. Furthermore, I don't have any money.