Write 1 before the action that started first, and 2 before the action that started second.

Hi Mom. I was leaving you a voicemail when you picked up.

I was leaving you a voicemail.  
You picked up.

I had a terrible walk home. When the storm started, I was coming home from work.

The storm started.  
I was coming home.

A painter next door was climbing a ladder when lightning hit the house.

A painter was climbing a ladder.  
Lightning hit the house.

I heard him yell while I was running for cover.

I heard him yell.  
I was running for cover.

He fell off the ladder when he saw the flash. Fortunately he's OK.

He fell off the ladder.  
He saw the flash.

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