The phrase "a substantial sum and" is correct and usable in written English.
It can be used when discussing a significant amount of money or resources, often in a financial context.
Example: "The project requires a substantial sum and additional resources to be successful."
Alternatives: "a considerable amount and" or "a significant total and".
Marlton paid a substantial sum and flew home, leaving the other crew members behind.
He sold them both for a substantial sum and they are now on their way to becoming a global brand.
It was a substantial sum, and those who couldn't afford it – the vast majority – were kept in the convent for three years, working in kitchens, greenhouses and laundries or making rosary beads and religious artefacts, while the church kept the profits from their labour.
The hospital has apologised, paid out a "substantial" sum and insisted "lessons had been learned".
For such a substantial sum and a monthly fee, you'd think they'd want to have feature parity with far less expensive platforms.
Most Americans have driven a substantial sum, and yet I don't think many of us can recall ever having to make the catastrophic moral choice between killing 10 adult pedestrians or three young children — or anything even remotely resembling such a dualistic, doomsday framework.
With the success of the Minstrel, who was later sold back to his original breeder, EP Taylor, for a substantial sum, Sangster and his partners quickly became one of the world's leading racehorse owners.
Associated Newspapers, publisher of the paper, had agreed to apologise and to pay a substantial sum in damages and costs.
A metal manufacturer can supply molten metal to a nearby foundry and save it a substantial sum in transportation and remelting costs.
Daniel Bishop, representing Newsquest, told the court his client wished to "publicly apologise" to Mr Sicri and would pay a "a substantial sum in compensation and his legal costs".
Often, an individual rolling savings over from a 401(k) to an IRA is making a decision about a substantial sum of money and is faced with a staggering array of investment options.
