Complex sentence: The Claremont Colleges are very fortunate that this land has remained undeveloped so that undergraduates at all levels can do "hands-on" ecology just a short walk from their indoor classrooms.
Split into simpler sentences: The Claremont Colleges are very fortunate that this land has remained undeveloped. Undergraduates at all levels can learn "hands-on" ecology a short walk from their indoor classrooms.