Complex sentence: Likas reached the quarter-finals of the 1948 U.S. National Championships, as the No.11 see; he reached the third round in 1946 and 1947, and the second round of the 1950.
Split into simpler sentences: Likas reached the quarter-finals of the 1948 U.S. National Championships, as the No.11 seed. He reached the third round in 1946 and 1947, and the second round of the 1950.