In order to give two causes/reasons in one sentence, present the sequence with the stronger cause-effect relationship first, expressing the cause in the te-form or followed by で.
Then, add the situation that results from that, which has been expressed in the て／で phrase, using から or ので.
たばこを吸って、医者にしかられたから、やめなければなりません。
I smoked and was scolded by my doctor; therefore I have to quit.
Lesson 10-7「よくわかりませんから、もう一度言って下さい。」
I'm not quite sure what it means, so please say it again.
Lesson 17-9「病気になったので、学校を休みました。」
I got sick, so I didn't go to school.