The phrase "almost separate from" is correct and usable in written English.
It can be used to describe a situation where something is nearly, but not completely, detached or distinct from something else.
Example: "The two communities are almost separate from each other, sharing only a few common resources."
Alternatives: "nearly distinct from" or "partially detached from".
They're almost separate from the programme.
This felt like an event almost separate from the album itself, a campaign with no real focus being spun into some sort of anti-establishment art project.
"I remember getting ready for those scenes, I was 16, and I was almost separate from myself: shocked by it, and curious, and excited.
Most chilling of all is the fact that someone with such a nihilistic vision, who views himself as almost separate from his own species, is given access to precisely those ingredients (synthetic viruses, nuclear technologies) that could hasten humanity's demise.
The borough is part of the Town of Stonington, the most southeasterly town in Connecticut, but because all of the borough's 170 acres are on a point of land, it seems almost separate from the rest of the town, particularly since railroad lines and Route 1 provide a sort of boundary to the north.
In some areas of the biofilm surface, the cells were almost separate from the biofilm (Figure 3a).
In the confusion, he was almost separated from his mother, and was handed back to her, through a train window, by a Russian soldier.
The western peninsula called the Rhinns of Islay is almost separated from the rest of the island by deeply incised sea lochs (inlets).
Significant wear on the pages, as well as on the spine, which is almost separated from the body, suggests that Monroe made daily use of the book, he added.
A tall tower with a landmark broach spire stands almost separated from the Decorated Gothic nave and chancel.
Because of the parents' recognition and care as well as enjoying a high degree of autonomy while growing up, the offspring almost never thought about separating from the parents and never seriously considered the meaning of "independence".
