Complex sentence: It seems that spirals were an important motif for the megalith builders, and have been found carved into megalithic structures all over Europe, along with other symbols such as lozenges, eye-patterns, zigzags in various configurations, and cup and ring marks.
Split into simpler sentences: It seems that spirals were an important motif for the megalith builders. They have been found carved into megalithic structures all over Europe, along with other symbols such as lozenges, eye-patterns, zigzags in various configurations, and cup and ring marks.