Complex sentence: When the custom of having regimental mascots first started is not clear; the earliest record is that of a goat belonging to the Royal Welsh Fusiliers in the 1775 American War of Independence.
Split into simpler sentences: When the custom of having Regimental mascots first started is not clear. The earliest record is that of a goat belonging to the Royal Welsh Fusiliers in the 1775 American War of Independence.