Simplify the following text for a Grade 12 native English-speaking person.
Original: More fundamentally , it can be argued that the most crucial challenge unanswered by this theory is how the relatively simple organic building blocks polymerise and form more complex structures , interacting in consistent ways to form a protocell .
Simplified: The most crucial unanswered challenge is how the relatively simple organic building blocks form more complex structures , and form a protocell .