Italian term
United Kingdom
Qualified medical translator
Native in: English
Works in: Spanish to English, Italian to English, Portuguese to English
Una metà del cuore… e l’altra metà
Una metà del cuore
Matilde
[description of Matilde]
... e l’altra metà
Marco
[description of Marco]
Proposed translations
Italy
Just what the doctor ordered
Native in: English (Variant: UK)
Works in: Italian to English
One part of the heart... and the other
"The heart of our business is a husband and wife team.
One part of the heart - Matilde - and the other - Marco."
Degree + PhD in Dentistry, ATA-Certified
Native in: Italian 
Works in: English to Italian, Italian to English, Italian
One half of the apple...and the other half
One half...and the other half of the apple
I think it might fit
--------------------------------------------------
Note added at 1 hr (2020-03-05 17:48:48 GMT)
--------------------------------------------------
You can also play with "organic apple", that might be cute.
On half...and the other half of the organic apple
and so forth
United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
one half of the loving team,.. along with the other half
--------------------------------------------------
Note added at 1 hr (2020-03-05 18:12:22 GMT)
--------------------------------------------------
They love, nurture their products into existence.
Mexico
Confianza, certeza, creatividad.
Native in: Spanish (Variant: Mexican)
Works in: English to Spanish, Italian to Spanish, French to Spanish, and 6 more.
one half of the essential part... and the other half
Italy
Legal translations
Native in: Italian
Works in: English to Italian, French to Italian, Italian to English, and 1 more.
on one side, the core is... on the other side, the core is
In this context, i think it refers more to the business, but in the end core of the business and core of the couple are the same here, though, which is a plus.
my opinion.
Canada
Over 20 Years Freelance Translation
Native in: English , French
Works in: Italian to English, French to English, English to French, and 9 more.
soul
For the romance.
Something went wrong...