、。
Some walked, others took bicycles.
Literal
Walk go people [if exist-もいれば], bicycle [with-で] go people [also-も] were.
The ~もいれば~もいる ('some X, others Y') pattern uses the ~ば conditional of いる with も to give a balanced 'there are both' reading. Literally 'if (we) have those who X, there are also those who Y.' Very common in description of mixed populations or parallel situations.