The phrase "are already split" is correct and usable in written English.
It can be used to indicate that something has been divided or separated prior to the current moment.
Example: "The documents are already split into different sections for easier review."
Alternatives: "have already been divided" or "are already separated".
"The small circle of people I trust are already split in their opinions.
Mormon message boards in America are already split: some thrilled that finally here's a Mormon that they – and the rest of America – can relate to; others warning that she should beware the wrath of her bishop.
For users this might not mean much, and some are seeing the Linux platform as a way to expand the community of software developers, who are already split down the Java and BREW lines.
Marylanders, of course, are already split, with a Republican governor and a Democratic majority controlling both houses in the legislature.
Devine et al. show that during gastrulation, heart precursor cells are already split into two distinct populations: one containing the cells that go on to form the atria and left ventricle of the heart; the other consisting of the cells that will make up the right ventricle and the 'outflow tract' that will eventually form the great vessels leading into and out of the heart.
If this did happen, it would be deeply divisive within Bahrain, where the population is already split over the whole issue.
The largely Sunni-backed Iraqiya party was already split, with the White faction that remains in parliament as opposition to the government seeing fissures in recent months over autonomy for the Kurds.
And the president's announcement put Mr. Romney, whose party is already split on the issue, in a tough spot, pressuring him to choose between further alienating Latino voters who chafed at the anti-illegal immigration stances he took in the primary season and alienating conservatives who reject policies resembling amnesty.
We observed furthermore that sometimes shells were already split open on the tree or cracked during fire.
The Church is already split because some of its members dispute the authority of its women priests.
The estimated nephilid ancestral age (40 60 Ma) rejects a Gondwanan origin of the family as most of the southern continents were already split at that time.
