Complex sentence: Within a short time, Crosby had hired Mullin to record and produce his radio shows and master his studio recordings on tape, and he invested US $50,000 in a Northern California electronics firm, Ampex.
Split into simpler sentences: Within a short time, Crosby had hired Mullin to record and produce his radio shows and master his studio recordings on tape. Crosby invested US $50,000 in a Northern California electronics firm, Ampex.