I found this one when reading 龍騎士(Eragon). Here’s the actual sentence from the book.
The full sentence from this is…
“Three horseman riding white horses slowly raced toward the ambush, with their heads raised proudly and clothing rippling like liquid silver in the moonlight.”
More literally — “Three riding-white-horse horsmen toward ambush slowly came running, their heads proudly raised, coats under the moonlight resembled liquid silver the same as ripples.”
As for the simplified version, nothing special, pretty straightforward.