Simplify the following text for a Grade 13 native English-speaking person.
Original: Among the arrivals on the Second Fleet were D'Arcy Wentworth and his convict mistress Catherine Crowley , on Neptune , and John Macarthur , then a young lieutenant in the New South Wales Corps , and his wife Elizabeth , on Scarborough .
Simplified: Among the people on the Second Fleet were D'Arcy Wentworth and his convict mistress Catherine Crowley , on Neptune , and John Macarthur , then a young lieutenant in the New South Wales Corps , and his wife Elizabeth , on Scarborough .