Complex sentence: During the First and Second World Wars firearms were only carried on protection duties, such as 10 Downing Street or escorting large sums of money, however, police were supplied with many firearms such as the cheap Canadian Ross Rifle in case of invasion.
Split into simpler sentences: During the first and Second World War, firearms were only routinely carried on protection duties, such as guarding 10 Downing Street, or providing escorts for large sums of money. However, the police were supplied with many firearms such as the cheap Canadian Ross Rifle in case of invasion.