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In perl

perl -n00E 'chomp;s/\n/ /g;say' your_file

Explanation

• -n: Operate on the file record by record
• -00: Means the record separator is two or more consecutive newlines
• -E : execute the following string as code while setting the default variable ($_) to the record currently being read from the file.
• chomp: remove the record separator from $_
• s/\n/ /g: Replace every newline encountered in the current record with a space (the g modifier ensures the replacement is "global").
• say: Prints the contents of $_ with a newline added at the end. It is used here instead of print because chomp will have removed the newlines separating the different paragraphs. It is equivalent to print "$_\n".
• We needed to use -E rather than -e because it enables the use of more recent language features; the say function in this case.