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I have a very simple issue, but can't get round of it.

I have a long sum of rational functions, which is in the form for example

[itex]\frac{n_{1}}{d_{1}}+\frac{n_{2}}{d_{1}}+\frac{n_{3}}{d_{1}}+\frac{n_{4}}{d_{1}}+\frac{n_{5}}{d_{2}}+\frac{n_{6}}{d_{2}}+\frac{n_{7}}{d_{1}\cdot d_{2}}+\frac{n_{8}}{d_{1}\cdot d_{2}}+\frac{n_{9}}{d_{1}\cdot d_{2}} [/itex]

and I would like to put it in the form

[itex]\frac{n_{1}+n_{2}+n_{3}+n_{4}}{d_{1}}+\frac{n_{5}+n_{6}}{d_{2}}+\frac{n_{7}+n_{8}+n_{9}}{d_{1}\cdot d_{2}} [/itex]

If I use Factor or Simplify it would just put all over one single denominator [itex]d_{1}\cdot d_{2} [/itex], taking also so much time since my expression is huge.

Any help?

Thanks