Complex sentence: Very few dinosaur bones are found above the K-T boundary; prominent Physicist Luis Alvarez proposed that this meteor strike caused dinosaur extinction, along with about 70% of all other species, either through direct impact effects or secondary effects on climate.
Split into simpler sentences: Very few dinosaur bones are found above the K-T boundary. Prominent Physicist Luis Alvarez proposed that this meteor strike caused dinosaur extinction, along with about 70% of all other species, either through direct impact effects or secondary effects on climate.