Complex sentence: A few times over the years, the Metro Vancouver health authorities have issued warnings that the beach Coliform counts are too contaminated for swimming-however for the most part, Wreck Beach tends to have a lower count than many Vancouver Beaches.
Split into simpler sentences: A few times over the years, Metro Vancouver health authorities have issued warnings that the ocean's coliform bacteria counts near the beach are relatively high and there may be a potential risk to swimmers. However, Wreck Beach tends to have a lower count than many Vancouver beaches.