What is the version of the following sentence with correct punctuation?

But no young puffins were seen on their way to the sea and as no one was seen towards the end of the month it has to be concluded that the puffins again had a very unsuccessful breeding season though it in the beginning seemed very promising
But no young puffins were seen on their way to the sea and as no one was seen towards the end of the month, it has to be concluded, that the puffins again had a very unsuccessful breeding season, though it in the beginning seemed very promising.