Problem: Continue the following story.

Samantha took exercise classes from Amy, because 
Here's how I want to continue it: Amy did not have to lose weight and get in shape.

Problem: Continue the following story.

His weight loss diet included rice but excluded meat, as the 
Here's how I want to continue it: rice was conducive to the weight loss goal.

Problem: Continue the following story.

Marge put the leftovers in the microwave and the turkey in the oven because the 
Here's how I want to continue it:
oven was better for cooking.