Add punctuation: Play your guitar playing and let the house full of music
A: Play your guitar playing, and let the house full of music.

Add punctuation: Discussions to use a very neutral word must be expected when some will become euromillionaires overnight whilst others have to continue with wheat barley and sunflowers
A: Discussions - to use a very neutral word - must be expected, when some will become euro-millionaires overnight, whilst others have to continue with wheat, barley and sunflowers.

Add punctuation: Next time Croatia ApS shall not be responsible for any changes of conditions not directly related to the accommodation unit ie fishing conditions changed conditions regarding the beaches swimming higher local taxes working hours of shops restaurants cancelled ski lifts etc Nexttime Croatia ApS shall not be responsible for lower standard of holidays due to bad weather local prohibitions in regard to places where swimming is allowed closing down of swimming pools
A:
Next time Croatia ApS shall not be responsible for any changes of conditions not directly related to the accommodation unit (i.e. fishing conditions changed, conditions regarding the beaches, swimming, higher local taxes, working hours of shops, restaurants, cancelled ski lifts etc.), Nexttime Croatia ApS shall not be responsible for lower standard of holidays due to bad weather, local prohibitions in regard to places where swimming is allowed, closing down of swimming pools....