заменить A1: C3 на вашу IMPORTHTML
формулу:
=SPLIT(QUERY(TRANSPOSE(QUERY(TRANSPOSE(A1:C3),,999^99)),,999^99), " ")
, если она содержит слова / пробелы:
=ARRAYFORMULA(SPLIT(QUERY(TRANSPOSE(QUERY(TRANSPOSE(
SUBSTITUTE(A1:C3, " ", CHAR(127))),,999^99)),,999^99), " "))