Complex sentence: Communal gatherings still take place at crosses as at Galashiels on "Braw Lads Day" or Peebles at the start of the Beltane Festival, and crosses often mark the start or end of Common Ridings as at Musselburgh or events such as the Stonehaven fireball ceremony.
Split into simpler sentences: Communal gatherings still take place at crosses, as at Galashiels on "Braw Lads Day" or Peebles at the start of the Beltane Festival. Crosses are often the place to mark the start or end of Common Ridings as at Musselburgh or events such as the Stonehaven fireball ceremony.