Add punctuation: Although I had previously been determined not to leave Sweden the opportunity to do research full time in a mathematically very active environment was hard to resist
A: Although I had previously been determined not to leave Sweden, the opportunity to do research full time in a mathematically very active environment was hard to resist.

Add punctuation: 20 David said to Solomon his son Be strong and courageous and do it Dont be afraid nor be dismayed for the LORD God even my God is with you He will not fail you nor forsake you until all the work for the service of the LORDs house is finished
A: 20 David said to Solomon his son, "Be strong and courageous, and do it. Don't be afraid, nor be dismayed; for the LORD God, even my God, is with you. He will not fail you, nor forsake you, until all the work for the service of the LORD's house is finished.

Add punctuation: The last playerteam left wins
A:
The last player/team left wins.