、。
Some students like baseball, others like soccer.
Literal
Baseball [subj-が] likable student [also-も] exist-[cond-ば], soccer [subj-が] likable student [also-も] exist.
The balanced pattern ~もいれば~もいる ('some X, and some Y') is a classic parallel construction. ~ば here is the conditional form of いる functioning as a coordinating conjunction — 'given that there are X, there are also Y.' The ~ば...~もいる paralleled pattern is idiomatic and very common for describing variety.