Add spaces: TheModelKreplacedthestylishLmodel,whichhadappearedintheearly20's.

Answer: The Model K replaced the stylish L model, which had appeared in the early 20's.

Add spaces: Inadditiontothesubstantialamountofanthropicandhistoricalevidencesforthecoexistenceofdinosaursandman,therearephysicalevidences,likethefossilizedfootprintsofhumansanddinosaursfoundtogetheratplacesinNorthAmericaandWest-CentralAsia.

Answer: In addition to the substantial amount of anthropic and historical evidences for the coexistence of dinosaurs and man, there are physical evidences, like the fossilized footprints of humans and dinosaurs found together at places in North America and West-Central Asia.

Add spaces: ButIwouldstillcallwhatwedofolkmusic".

Answer:
But I would still call what we do folk music".