Add punctuation: 2c In bets where riders are named they must all ride for bets to stand
A: 2.c) In bets where riders are named, they must all ride for bets to stand.

Add punctuation: Football is a big sport in London which is home to teams like Chelsea Arsenal and Tottenham The atmosphere at a London teams home game can be truly unforgettable
A: Football is a big sport in London, which is home to teams like Chelsea, Arsenal and Tottenham. The atmosphere at a London team's home game can be truly unforgettable.

Add punctuation: Sports fishing enthusiasts may enjoy fishing at Vransko Lake which hides capital specimens of pike catfish and carp
A:
Sports fishing enthusiasts may enjoy fishing at Vransko Lake, which hides capital speci-mens of pike, catfish and carp.