The phrase "a long attached" is not correct in standard written English.
It seems to be an incomplete expression and lacks clarity without additional context.
Example: "He has been a long attached member of the committee, contributing significantly over the years."
Alternatives: "a long-standing" or "a long-term".
Kobe Bryant, is the N.B.A.'s most feared clutch performer, a label long attached to West, whom Bryant counts as his greatest mentor.
The title refers to "the wonder of the western world", an epithet long attached to Mont-Saint-Michel, the magnificent medieval abbey on the Normandy coast, a great symbol of faith, object of pilgrimage and example of sublime architecture.
A balloon (2.5 cm long) attached to a catheter (PE-240) was placed in the stomach through a small incision.
He bolted the lumber together into a beam seven feet long, attached the blade to one end, and screwed one wing of a hinge to the other.
His father took him to a track where they saw gasoline-powered cars no more than two feet long, attached to a cable and circling a small track at unbelievable speeds.
Wilson, 22, has managed to produce a gun using a commercial 3D printer which successfully fired a shot – but in testament to his own nervousness about safety, he used a piece of string 20ft long attached to the trigger.
There's a picture of Mel Gibson suspended from a long pole attached to a bicycle.
By 3pm the wind was approaching gale force, and they did what Frank always did: take down the sails and mast and put out a drogue or sea anchor – a canvas bucket on a long line attached to the bow.
Then they would take 2 little vigil lights from the church and a long string attached in the front, and they'd go up and down the sidewalk pulling their steamboat.
Each magnet has a long cable attached to it, a button on which releases the magnet's hold and allows him to move his feet independently.
