Complex sentence: In the valley of Kashmir and in Baltistan, the Nurbakhshia gained their greatest prominence in the early 16th century because of the missionary efforts of Mir Sham ud-Din Iraqi, himself a disciple of Sayyid Muhammad Nurbkhsh's son and spiritual heir, Shah Qasim Faizbakhsh.
Split into simpler sentences: In the valley of Kashmir and in Baltistan the Nurbakhshia gained their greatest prominence in the early 16th century. This was due to the missionary efforts of Mir Sham ud-Din Iraqi, himself a disciple of Sayyid Muhammad Nurbkhsh's son and spiritual heir, Shah Qasim Faizbakhsh.