"which signaled that" is a grammatically correct and commonly used phrase in written English.
It is typically used to introduce a clause that provides additional information or context to the previous statement. Example: The sudden drop in stock prices, which signaled that the company was facing financial trouble, caused panic among investors.
Later that year Radcliffe won the world half marathon title, which signaled that her future might lie in the longer distances.
"At the bottom it said DB/afq, which signaled that an assistant had typed the letter on David's behalf," Goldberg wrote in an e-mail.
Copper fell on a decline in manufacturing jobs, which signaled that pipe and wire makers would be using less of the metal.
Johnson also admitted earlier in training camp that he was surprised by the amount of coverage Tebow had gotten, which signaled that Johnson had not paid a bit of attention to the Tebow overload that overtook Denver last year.
In July, Finance Minister Donald Kaberuka was elected president of the African Development Bank, which signaled that the country was ready to take its place in pan-African policy making and diplomacy.
A1 Thousands of enraged Palestinians at the funeral of a slain Hamas official vowed to take sweeping revenge against Israel, which signaled that it would continue to hunt down the leaders of militant groups.
But so many serialised books came through in our top 100 list, which signals that is what people like reading.
"Kitchen Stool," which signals that the artist appreciates the time when he's at home, does this, too.
Still, initial claims haven't spiked, which signals that businesses are retrenching.
Italian bond prices are up again, driving down the yield on its debt (which signals that it would be cheaper for Italy to borrow).
In NYPD Blue, Bochco introduced near-nudity and cursing that at least sounded filthy, which signalled that the values of television were back on speaking terms with those that prevailed in the cinema.
