Complex sentence: After the demise of the Shingeki Kenkyusho Institute in 1929, Tanaka composed a short play titled "Ofukuro" ('ma' or'mom') which became a great success and seemingly overnight, Tanaka was thrown into the spotlight as a promising dramatist.
Split into simpler sentences: After the demise of the Shingeki Kenkyusho Institute in 1929, Tanaka composed a short play titled "Ofukuro" ('ma' or'mom') which became a great success. Seemingly overnight, Tanaka was thrown into the spotlight as a promising dramatist.