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Another one:
awk -F= '/^Begin/{s=x}NF==2{s=s?s OFS $2:$2} /^End/ && s {print s}' file

Your example output seems missing a "some" in the 1st line. Anyway:

# awk -F= '/^Begin DS/ {i++} i && /^var[0-9]=/ {a ? a=a " " $NF : a=$NF } /^End DS/ {print a; a=x; i--}' infile
some text 2 b...