1- The Georges fall in a state of absolute poverty.
The Georges fall in a complete state of poverty.
2-Leonard has a heart attack and dies.
As a result, Leonard suffers from a heart attack and dies.
3-Everything goes as designed.
Everything goes as planned.
1. "fall into" if used in a narration or "fell into" depending on context
2. "has a heart attack" and "Leonard suffers a heart attack" if used in a narration or had/suffered (past tense) depending on context. "Suffers from" would be used if the person continues to live.
3. "goes as planned/designed" if used in narration or "went" depending on context.