Add punctuation: Each player has 17 pieces placed two at a time in shifts around the board
A: Each player has 17 pieces, placed two at a time in shifts around the board.

Add punctuation: We fight pests lice and thrips with natural means adding special kinds of mosquito wasps and reduviids
A: We fight pests (lice and thrips) with natural means, adding special kinds of mosquito, wasps and reduviids.

Add punctuation: Phase out of nuclear and fossil energy consumption
A:
Phase out of nuclear and fossil energy consumption