Complex sentence: A round number is informally considered to be an integer that ends with one or more zeroes (0), a number ending in 5 might be considered in a way more "round" than one ending in 0.
Split into simpler sentences: A round number is informally considered to be an integer that ends with one or more zeroes (0). A number ending in 5 might be considered in a way more "round" than one ending in 0.