Complex sentence: Settlement was first attempted under the command of Plowden in 1642, but this ended in an attempted mutiny, after which Plowden managed New Albion from the Colony and Dominion of Virginia, selling rights to adventurers and speculators, until he returned to England in 1649.
Split into simpler sentences: Settlement was first attempted under the command of Plowden in 1642, however it ended in an attempted mutiny. After the attempted mutiny, Plowden managed New Albion from the Colony and Dominion of Virginia, selling rights to adventurers and speculators, until he returned to England in 1649.