Complex sentence: Snowblades are worn with a hard alpine ski-type boot, and appeal in a semi-cultesque way to individuals of various ages and backgrounds, as was the case with snowboards, when they made their first appearances on ski slopes decades ago.
Split into simpler sentences: Snowblades are worn with a hard alpine ski-type boot, and appeal in a semi-cultesque way to individuals of various ages and backgrounds. As was the case with snowboards, when they made their first appearances on ski slopes decades ago.