Complex sentence: Johnson realized that such a simple amendment might not result in a coin being issued, and returned to the House floor soon thereafter, asking that the bill be reconsidered, so he could couch his amendment in the same phrasing as for the other two coins.
Split into simpler sentences: Johnson realized that such a simple amendment might not result in a coin being issued. He therefore returned to the House floor soon thereafter, asking that the bill be reconsidered, so he could couch his amendment in the same phrasing as for the other two coins.