[Python] replace CRLF characters in middle of row for unquoted csv file using python

I am receiving below sample data in a txt file from source. The file contains a header row which signifies how many columns are expected per row

ID,First name,last name,description,birth date<CR/LF>
1,Smith,John,Loves to skateboard,12/3/98<CR/LF>
2,Johnson,Mike,Eats worms,2/14/75<CR/LF>
3,Howard,Sally,Walks along the beach<CR/LF>
Likes bike rides<CR/LF>
Loves to cook,9/7/67<CR/LF>
4,Doe,Jane,Restores classic cars,7/4/74<CR/LF>


For line number 3 there are extra CR/LF characters inside the data itself causing it to span across multiple lines in the file. How to remove the additional CR/LF characters inside the data but not at the line ending using python.

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