Complex sentence: The Maratha's surely fought the Mughals and British with courage but this church and its followers were here even before any of this, the entire land in that time from Dahisar to Andheri belonged to the church.
Split into simpler sentences: The Maratha's surely fought the Mughals and British with courage. The entire land in that time from Dahisar to Andheri belonged to the church.