Answer:
All of my sisters are doctors, whereas I am a teacher.
Step-by-step explanation:
The given two sentences can be joined using 'whereas' in the form of a complex sentence as mentioned above. It is a conjunction that is employed at the beginning of the subordinate clause('whereas..teacher') to indicate or throw light upon a significant difference between two ideas or to state facts. In the given sentence, the contrast between 'my sisters' and 'I' have been shown which is both a fact and the difference as well. Thus, the final sentence reads as:
'All of my sisters are doctors, whereas I am a teacher.'