Simplify the following text for a Grade 7 native English-speaking person.
Original: Year 1913 ( MCMXIII ) was a common year starting on Wednesday ( link will display the full calendar ) of the Gregorian calendar and a common year starting on Tuesday of the 13-day-slower Julian calendar .
Simplified: 1913 ( MCMXIII ) was a common year starting on Wednesday of the Gregorian calendar .