The phrase "simultaneous with the" is grammatically correct and commonly used in written English.
It means that two or more events are happening at the same time. Example: "The launch of the rocket was simultaneous with the countdown reaching zero." This sentence means that the rocket was launched at the exact same time that the countdown reached zero.
It was nearly simultaneous with the bombing of the American Embassy in Tanzania, which killed 11 more.
Christians took this episode to be simultaneous with the death of Christ.
Simultaneous with the demise of feudalism was a rise in urbanization.
So, last week, simultaneous with the Open Platform launch in London, it was great to be delivering a keynote at the European conference for Solr/Lucene in Prague.
Simultaneous with the last piano chord of "It's Only a Paper Moon," Kenny Washington struck the middle of his cymbal once with the handle of his wire brush.
Simultaneous with the conical rotation, asymmetrical sinusoidal waves pass from the base to the end of the flagellum.
Simultaneous with the early Soviet and U.S. efforts to produce land-based ICBMs, both countries were developing SLBMs.
Simultaneous with the opening up of these resource industries, the treeless prairies were rapidly settled, and the demand for lumber was best filled from within British Columbia.
Simultaneous with the transfer of funds, the witness made the statements that incriminated officers of the Buenos Aires provincial police in the theft and sale of the vehicle used to blow up the Jewish center.
As Silverman recalled the play, "It looked like Jackie, at the very worst, had gotten to the base a half step ahead of the ball, or certainly simultaneous with the ball.
Simultaneous with the attack, choppers with speakers on them are going to start circling over the village, telling the villagers to assemble in the center of the town or they will be considered V.C.s.
