Complex sentence: Nowadays Bukkur island is occupied by an Army public school, and the tomb of Sayyid Sadruddin, who was son of Sayyid Muhammad Al-Makki.
Split into simpler sentences: Nowadays Bukkur island is occupied by a school (Army public School) and a tomb. The tomb belongs to Sayyid Sadruddin who was son of Sayyid Muhammad Al-Makki.