Reciting two Soorahs in a single rak'ah
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Question: Is it permissible to combine (the reciting of) two Soorahs in a single rak'ah of an obligatory prayer?

Response: There is no harm in combining (the reciting of) two Soorahs in a single rak'ah of an obligatory prayer. However, if doing so causes difficulty for the congregation behind him in an obligatory prayer, then it should not be done.

Shaykh Ibn 'Uthaymeen
Liqaa.aat al-Baab al-Maftooh - Volume 1, Page 49, Number 78