Complex sentence: In 1946, Najdorf tied for 4th-5th with Laszlo Szabo at Groningen, with 11.5/19; the event was won by Mikhail Botvinnik.
Split into simpler sentences: In 1946, he tied for 4th-5th with Laszlo Szabo at Groningen. The event was won by Mikhail Botvinnik.