Bo Jackson tried to play both baseball as well as football.
Bo Jackson tried to play both baseball and football.
Bo Jackson tried to play both baseball as well as football.
Bo Jackson tried to play both baseball and football.
We can use "both P and Q" to join two items in parallel, or we could use "P as well as Q", but we can't combine e two idioms: the construction "both P as well as Q" is redundant and incorrect.