Complex sentence: The church is now available for organ recitals, concerts, occasional acts of worship by various congregations without their own church and for secular events, the income from which helps to maintain the fabric, as the church is not endowed.
Split into simpler sentences: The church is now available for organ recitals, concerts, occasional acts of worship by various congregations without their own church and for secular events. Income from which helps to maintain the fabric, as the church is not endowed.