When a denominator has been distributed in a fraction, the value of the expression afterwards is exactly the same, so in a sense nothing has happened to the fraction. The numbers and appearances might change, but the mathematical quantities they represent are still the same.
If the denominator of the fraction divides evenly into all or part of the numerator, the fraction can disappear as it is simplified into integers. For example in the expression (4x + 8)/2 the 2 can be distributed to be 4x/2 + 8/2 and then simplified to 2x + 4.
If the denominator does not divide evenly into parts of the numerator, the single fraction can be replaced by the sum or difference of multiple fractions. For example the fraction (3x + 5)/4 can have the denominator distributed to become 3x/4 + 5/4.
If parts of the numerator are the same as parts of the denominator, they can possibly cancel out and disappear. For example, (3x + 2) / x becomes 3 + 2/x when the x in the denominator is distributed and the x's in the first term of 3x / x cancel out.