When a sentence is complex, it has two clauses: de main (or independent) and the subordinate (or dependent) clause.
These two clauses are linked by subordinating conjunctions.
The best way to combine these two sentences and transform them into a complex one is to link them with the subordinating conjunction SINCE. The result would be:
It is good to carry almonds with you since they are one of the best foods for regulating blood sugar.
