Simplify the following text for a Grade 8 native English-speaking person.
Original: The Grameen Bank started to diversify in the late 1980s when it started attending to unutilized or underutilized fishing ponds , as well as irrigation pumps like deep tubewells .
Simplified: The Grameen Bank started other groups in the 1980s to do things such as keeping fishing ponds clean and building irrigation pumps .