Complex sentence: At the weekend, there is also a 3 pm Evensong service on Saturdays and Sundays with a main cathedral Eucharist at 10:30 am, which attracts a large core congregation each week, and also by Evensong at 3 pm and a more intimate Communion at 4 pm.
Split into simpler sentences: At the weekend, there is also a 3 pm Evensong service on Saturdays and Sundays with a main Cathedral Eucharist at 10:30 am, which attracts a large core congregation each week. It also has Sunday Evensong at 3 pm and a more intimate Communion at 4 pm.