Complex sentence: In the 1930s wirephoto machines of any reasonable speed were very large and expensive and required dedicated phone line, and news media firms like the Associated Press used expensive leased telephone lines to transmit wirephotos.
Split into simpler sentences: In the 1930s, wirephoto machines of any reasonable speed were very large and expensive and required a dedicated phone line. News media firms like the Associated Press, used expensive leased telephone lines to transmit wirephotos.