James 1:15

15 Then, after desire has conceived, it gives birth to sin; and sin, when it is full-grown, gives birth to death.

Read James 1:15 Using Other Translations

Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
Then desire when it has conceived gives birth to sin, and sin when it is fully grown brings forth death.
These desires give birth to sinful actions. And when sin is allowed to grow, it gives birth to death.