"sandy and thomas " is an example of a subject.

This is an example of a multiple subject. In English, a sentence can have one subject or multiple ones.

Example: John is a very responsible student. (This is an example of a single subject.)

John and Ana are very intelligent students. (This is an example of a multiple subject.)

Other examples of multiple subjects include the following:

My sisters and I played together in childhood.

My dog, my cat, and my bird are the most beautiful animals in the world.

In a sentence, you can have the number of subjects you wish, always that then they are well conjugated; that is, they should be conjugated in the plural form of the verb because they are more than one subject.

bildungsroman is a german word for novel covering youth to adulthood which describes a coming-of-age story

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.