original: The front decayed and dissipated, leaving behind two areas of low pressure.
simplifications: Two areas of low pressure were left after the front was destroyed. The front disappeared, leaving two areas of low pressure. The front eroded and created two low pressure areas. The front decayed and dissipated. This left behind two areas of low pressure. The front grew weak and went away. It left two places with low pressure. The front gradually broke down which left behind two areas of low pressure. The front died down, leaving behind two areas of low pressure. The front rotted and broke apart. It left behind two areas of low pressure. The front decayed and emptied leaving behind two areas of low pressure. The front decayed and dissipated. This caused two areas of low pressure.