Simplify the following text for a Grade 10 native English-speaking person.
Original: A fundamental connection was noticed between the module theory , and the p-adic L-functions that were defined in the 1960s by Kubota and Leopoldt .
Simplified: A basic connection was noticed between the module theory , and the p-adic L-functions that were defined in the 1960s by Kubota and Leopoldt .