I am sure there are tons of ways to do this, but here's what I came up with quickly:
tr '\n' ',' < csv.txt | sed 's/T,/T\n/g'
abc/qwe/123/ert,Jun 18 2015 13:24:03 EDT
adc/gwe/153/poi,Jun 18 2015 14:24:03 EDT
Where 'csv.txt' is a file containing your original example text. Tested under Debian 8.
tr '\n' ',' removes ALL newlines and replaces them with a comma.
sed 's/T,/T\n/g' replaces each 'T,' with a T followed by a newline (\n).
This is obviously far from foolproof, but works in this specific case.